Many of those who took part in the crowd shots during the shooting of the wedding scene with Don Corleone in The Godfather were actually really gangsters and their relatives. This was one of the first movies to shine a light on the internal world of America’s mafia clans, and, moreover, it was the first to be "blessed" by some of their most influential figures — many gangsters wanted to take part in the filming.
PS: Found it on the internet without the nipples covered. Big deal. Nothing to see, really.