If you look at the history of Italian mobster Lucky Luciano, you'll find that most of the interesting stuff that happened in his life was when he was young. Forming a street gang as a kid, being arrested numerous times, surviving being stabbed and beaten over and over again. Working for the old school, 'Moustache Pete'-type mafioso, Luciano sought to get rid of the old guard and get rid of the 'boss of all bosses' title that encouraged rivalry and instead put in place a commision of mob families that could be mediated and would avoid gang wars. It's a bit of mystery why this film starts at this point, skips his trial for pandering in the US, and goes almost straight away to his deportation to Italy.
We do get a bit about Luciano's involvement in the preparations of the invasion of Sicily and the immediate events following this (the mob basically controlling the black market while pretending they are doing the opposite, and also assisting the US army in sending intelligence back from Sicily), but a lot of this doesn't acutally involved Luciano at all! This, plus a sub plot involving Rod Steiger as a treacherous drug smuggler, mean that for about three quarters of the film, actor Gian Marie Volonte doesn't have much to do with the Luciano character.
The film jumps between various events which also fractures the narrative a bit more, but the film isn't a disaster, just a bit unengaging. Volonte, when he does have something to play about with, conveys Luciano as a charismatic, confident man, presenting himself as a charmer to the various journalists who follow him about and as an innocent deportee to the police who are trying to hang a drug smuggling charge on him.
Violence and action wise there's not much going for it, save for the murder of the old mafiosi at the start of the film. If you've read any history on Luciano, you'll know what happened to him in the end. It's interesting, but not the best way to end of film!
