Probably looked enough like Edward G. Robinson. The Hollywood films of the 30's gave the Europeans a pretty good image of American gangsters. There's a funny moment (one of many) in a book called "The OSS and I" when Morgan, the author, is teaching French resistance fighters how to fire the .45 from a boxer crouch. One of them remarked "Aha . . . Morgan eez Cheecago Gangstair!"