"There's a bubble there that's going to burst at some point and when it does it's not going to be good," Franzese, a former mob boss for the Colombo crime family in New York who has become an author and motivational speaker, told CNBC.
It's not just the valuations. He's got another reason for advising investors to keep their money off Wall Street.
"I did a lot of things at times with people on Wall Street," said Franzese, who believes there is still a contract out on his life. "A lot of guys are shady and they did shady things with me and I don't trust them. And I don't like other people that I don't know really well taking care of my money. I think that I can do it better."
He advises investing in gold and silver, physical bars.