Sure. But when I say, “professional hit man” I don’t mean a gangster, a mobster, or a spy. I’m referring to more of the professional hitman as seen in popular culture: https://tvtropes.org/pmwiki/pmwiki.php/Main/ProfessionalKiller

Think the trope in fiction. Someone wants someone killed. They find the shadiest person they can, like their tweaker cousin’s dealer. They then ask this shady person if they can put them in touch with a contract killer. Through the grapevine, they meet with someone who is literally a professional killer-for-hire. The usual trope is some extremely well-put together gentleman; he probably wears a 3-piece suit and black leather gloves. He probably views killing as an art form. He takes professional pride in it. He’s probably obsessed with expensive firearms and their various accessories, and he personally owns an arsenal big enough to take down the government of a modestly-sized city. Killing is his passion; he only charges at all because he has bills to pay like anyone else. The usual trope is to imagine someone as professional and presentable as the most formal lawyer or doctor you can imagine, except their business is killing.

While the real world version of a professional killer wouldn’t be so extreme, the core should remain if they are to be a professional killer. They don’t need to dress in a suit, have a private arsenal of rare expensive weapons, and speak in a British accent. But they should still meet the minimum definition of professional to count as a professional hitman. A “professional” is generally someone who offers a specific service to the public as their primary occupation. Lots of people know first aid. But only a doctor or a nurse makes medical care their actual profession. Most people can replace a light switch, but that doesn’t make them a professional electrician. A professional usually sees some higher purpose or artfulness in their services and seeks to provide them to all that can afford them.

Sammy Gravano was a mobster, a terrible human being, and a ruthless killer. But he was a mobster first, and a killer second. He committed numerous other crimes on behalf of the mob, not just murder. And he didn’t commit murders that weren’t at the behest of the mob. You, as a random stranger, couldn’t just knock on his door, hand him a bag full of cash, and get him to off someone for you. In fact, he would probably kill YOU just for trying.

Per OP’s original question, Sammy Gravano does not count. There was no way for some random person back during his day to find him, hire him, and have him take someone out for them. He was a mobster, not a professional hitman-for-hire. And that is a crucial distinction.

Professional hitmen don’t actually exist. It’s a ‘business’ that you can’t possibly advertise for and has no way for the customer to assess the quality of the provider in advance. Sometimes killings do happen in exchange for money, but they don’t involve someone that is a professional killer that works with the public as their primary source of income. It just doesn’t exist. But there are some cases where killing does happen for money.

Sometimes two people will conspire to kill another for profit. Maybe one spouse hates another spouse. They ask a close friend or relative to kill their spouse, and they offer a portion of proceeds from life insurance as a payment for their risk and trouble. Or they’re cheating on their spouse with someone else, stand to inherit all their spouses assets upon their demise, and promise to marry the person they’re cheating with, thus sharing all the assets with them. In this case, it’s not a stranger being hired; the killer has known the person ‘hiring’ them for decades.

Some killings-for-hire are gang related. A gang wants someone killed. They don’t hire a random person to do it. They get one of their own members, who they’ve already known for many years and is a full member of the gang. In compensation for the huge risk the person is taking on to perform the deed, they offer a large sum of cash. Again, an unvetted stranger is not being hired. This person has likely already committed numerous crimes on the gang’s behalf in the past. When you’ve already committed enough crimes on a gang’s behalf to get you years in prison, a murder isn’t such a stretch.

Some killings-for-hire are done at the behest of nation-states. Spycraft. The KGB or CIA hire someone in a foreign country who is already sympathetic to them to kill someone the intelligence agency wants taken out. The intelligence agency doesn’t just select anyone, they go through a long vetting process just like they would any other intelligence asset. In fact, the potential assassin has likely already provided good intelligence and assistance to them for years, already risked extensive jail time or worse. If you’re a US military member that’s been providing intelligence to the KGB for a decade and have already participated in sabotage efforts, you’re already looking at treason charges if you’re caught. Offing someone for the KGB isn’t such an escalation. And when a nation-state hires someone to perform a killing, they also offer the person a plausible way out. The CIA can hire someone to kill someone for them in a foreign country and hand that person a US passport along with a few million safely in a US bank account in their name. Hell, they can make sure the assassin’s family has been given US citizenship and is already in the US before the deed is done. The CIA assassin can perform the killing, and as long as they can get to US or friendly territory before the foreign cops catch up with them, they’ll be completely free and clear. And regardless, their family will already be set for life in the US.

These are the kinds of scenarios where killings actually do occur in exchange for money. No one hires someone to kill another that they haven’t heavily vetted. If a random civilian is going to hire someone else to kill someone, they won’t hire a professional assassin. They’ll hire their brother or their lover. Otherwise contract killings only are done by organizations like gangs or national intelligence agencies, and they only hire people to do so that they’ve worked with for years and who has already committed numerous less severe crimes for them in the past.

In short, there really is no such thing as a professional assassin that serves the general public. Maybe if you are the spouse of a high-level violent gang member, you might be able to convince them to use the gang’s resources to pay one of their trusted members to kill someone in exchange for cash. But if you’re just a random average person? Forget it. There simply are not professional contract killers hiding in the shadows that a random civilian can hire if they have the cash. Anyone claiming to be that is simply a cop. Any person who DID try to start a career like this would be caught very quickly and have a very, very short career.

What is likely the cause of this is one thing that people miss about solar panels. Their efficiency is a function of temperature. In the summer, you get more sunlight, but the panels themselves are hotter and thus lose efficiency. In the winter there is less light, but the panels make the most of every photon.

Sundom in Horizon

I mean, I’m not expecting anyone to actually start rebuilding temples to Helios any time soon. But if you want to, I’m not going to stop you. Live your dreams!

We are currently undergoing the greatest transformation in energy infrastructure since the start of the industrial revolution. Solar power and batteries are not only growing, but absolutely exploding.

Solar has become so cheap so fast that it’s going to fundamentally change the very way we use power and energy as a civilization. Seriously, look at new power generation by source. It’s almost all solar and wind, with a bit of nuclear and natural gas as a rounding error. And really, new power generation is majority solar.

The key thing is that solar is a technology that can be mass produced in absurd quantities. And the more we produce, the cheaper we can produce it. It appears now that solar is this epochal leviathan, a glacier sweeping across the energy landscape that will grind everything else to powder before it.

We have a very clear path to a grid that is almost entirely solar and wind. There’s nothing wrong with nuclear, but it cannot even begin to compete economically against the tsunami that is the solar revolution. Hell, I expect the grid to be almost entirely solar in the future.

Obviously the Sun doesn’t shine all the time, but panels have gotten so cheap, so fast, that a lot of these problems are just being carried away by the solar tsunami. For swings over the course of a day, batteries are getting so stupid cheap that we’re going to have no problem making enough power during the day to meet our needs at night. But the bigger concern was always seasonal variation. How can we possibly store enough energy to last through a winter? In years prior, this was seen as the Achilles’ heel of a largely solar grid. To store that much energy in batteries would seem completely impossible.

But it seems the seasonal problem is going to solve itself. You see, if solar power gets cheap enough, you can start doing really wild things with it. Even on a snowy day in winter, solar panels still generate some electricity. They may only generate 10-20% of what they do on a clear summer day, but they still generate power. And if solar is cheap enough, you can simply size your system so stupidly large that you can meet even your winter’s need without any seasonal energy storage. If you spam enough solar panels, you can meet your needs in the winter and then have dirt cheap, essentially free power the rest of the year. And it really looks like this is where we’re headed.

I foresee that many of our most energy-intensive industries will adopt a seasonal or semi-seasonal schedule to take advantage of the dirt cheap power in the warmer months of the year. We have a crop growing season, why not an aluminum smelting season or an AI-model training season? Or that free summertime power could be used to desalinate vast quantities of seawater affordably. Or, such a low-cost energy source is exactly what we need to make bulk atmospheric carbon removal a real possibility.

We used to live in tune with the cycle of the seasons. We lived according to the cycle of the Sun. So important was the Sun to our ancestors that we named our greatest deities after it. Amun. Aten. Ra. Huītzilōpōchtli. Ba’al. Aryaman. Mithra. Apollo. Helios. Sol Invictus. These were but a handful of the thousand names we gave to the mighty Sun upon which we so depended. We rose to its light and slept in its absence. We worked when it shone brightest and in the winter, invented elaborate holidays and rituals to encourage its return. We built our entire calendars and organized our entire civilizations around its cycles.

With the Industrial Revolution, we abandoned this close relationship with the Sun. We learned to draw upon bottled remnants of old rotted sunlight, and for a time learned to live apart from the mighty Sun. And those energies in fossil fuels improved our lives so greatly; they raised us up from the mud. We improved our standard of living so much, that we would rather burn the world to ashes than give up the lifestyle we have grown accustomed to. And so, the great challenge of our age is to find a way to keep our lives and comforts going, without destroying the Earth in the process. Millions of people have dedicated their lives to this one central challenge of our age. All our efforts. All our sciences. All of our industry. Our brightest minds and every tool of finance and government at our disposal. All of it searching, seeking, trying to desperately to find a way out of this horrible trap that we have built for ourselves.

And now, after all this yearning. After all this wondering. After all this wandering. The solution was in front of us this entire time. A ray of Sunlight has been cast down into the cave that we are so lost in. And it is leading us back to the light. We will cast off these shackles and leave the fossil fuels in the dust where we found them. We will once organize our entire civilization around the infinite bounty that the Sun freely gives in such abundance. And we will continue to enjoy the fruits that science has given us, but in a way that not only does not damage the Earth, but allows it to heal. That is the future ahead of us. That is the light in the darkness. As our ancestors did from time immemorial, we will once again live in the endless generosity of the star that birthed us. And we will rejoice. And we will sing.

Sol Invictus. We are coming home.