Was Perry Como in the Mafia?

He was not in the mafia.

Never heard that Perry Como was in the Mafia, but then they did not broadcast that information at the time Perry Como was around.  His parents were originally from Italy but he was born in the USA.
Perry Como was a good singer and was very popular right up until his death in 2001.

Not that I know of, but he's one of my favorite singers! 

He was threatened by them to associate with them, like all Italian celebrities and also Hollywood bosses were.

I doubt it - he wasn't in the 'Rat Pack' with Frank and the boys.

Probably not but he and a lot of his contemporaries performed in night clubs that were owned by the Mafia.

Wasnt he the guy who sang white bread while sleeping onstage?

He just sang at their weddings