Certain friendships play a part in history in that without the relationship history itself might have been different. FDR and Winston Churchill for example. It works negatively too, just look at Lyndon Johnson and Bobby Kennedy.
In gangland lore and this was by no means easy in those clannish days the friendship of Italian Charles Luciano with Jewish Meyer Lansky. Crossing ethnic and religious lines was by no means easy then, but these two formed the national syndicate of organized crime that still is in operation.
Richard Dreyfuss and Anthony LaPaglia play the mature Lansky and Luciano characters. Eric Roberts is Ben Siegel otherwise known to those who didn't know him as Bugsy. You've seen parts of the story in Mobsters from Luciano's point of view and in Warren Beatty's film Bugsy. In Lansky the same story is now told from Meyer's point of view. The kid who saw pogroms in Poland and who fought with Ben Siegel's help on New York's mean streets to stay alive.
The main component of the Lansky Legend is that the man was never convicted of a major crime. As Dreyfuss says you keep it all in your head and write nothing down. You do have to have prodigious memory to do that and apparently Lansky did.
The story is told in flashback with an aging Dreyfuss in Israel hoping to settle there the rest of his days exercising the law of return. Politics intervened and he couldn't do it. He has some interesting explanations why.
It ain't exactly history but pretty close. These people fascinate us and will do so for the next century.