Unless you know the business, stay away.

That's the advice of Alex Stewart, a restaurant tour, speaking about the restaurant industry.

It sounds like a warning about organized crime, no?

Well, those two things, restaurants and mobsters have been known to go together at times.

We all know the restaurant scenes from our favorite mafia films.

Some are so well known, they've become gifts, Ray Leota laughing uncontrollably at Joe Pesci.

Michael Corleone, assassinating Soloso and the corrupt police chief with a gun that was planted for him in the back of a toilet.

De Niro, sitting across from Puccino in heat.

Just two guys with a table between them escalating the plot.

Gangsters and restaurants go together in our mythology.

And those words of warning from Alex Stewart may well have echoed out to him from the mob-era ghost in the walls of his famed kitchen, Harvey's.

Once known as the restaurant of presidents and originally located on Connecticut Avenue in DC by the Mayflower Hotel.

Harvey's was just a five-minute walk from the Department of Justice headquarters.

Alex Stewart bought the restaurant in the late 1960s.

A couple of decades after its most infamous patron first ordered his lunch regular, steak and Caesar salad.

In those days, Harvey's had separate gender dining rooms, which suited the steak and Caesar salad man perfectly.

He was as well known for his misogyny, as he was for his bushy eyebrows, white shirt, and brick brother's suit.

On arrival, a bottle of red wine waited for him at his table, the most secure and invisible from the door.

And he'd usually dine with a deputy, a friend or advisor, and always an armed bodyguard.

There, over lunch, the man would plot and plan his operations, catch up on the state of affairs in the world, and keep an eye out.

For who else might saunter into the restaurant? He treated as his own.

He even signed autographs there for the rare soul brave enough to approach him and ask him for one.

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