My Blue Heaven (1990) on Netflix

Vinnie is a smooth-talking mobster who is relocated from New York City to a suburb of San Diego by the Federal Witness Protection Program in exchange for testifying against the mob. He must start life over in a quiet town with nothing to keep himself entertained - until he runs across some old friends from the Big Apple and they start up a little business of their own. Vinnie's bad behavior wreaks havoc on the life of Barney Coopersmith, the straitlaced FBI agent assigned to protect him. Barney must struggle with Hannah, the local assistant D.A., to keep Vinnie out of prison and safe from the mob before his testimony. Before long, Vinnie is sweet-talking Hannah into dates with Barney and teaching Barney how to dance, dress, and become a lady killer as they run from Mafia hit men and nearly escape murder in Manhattan.