Johhny was Sonny's brother-in-law when he was married to Claudia Zacchara. Johnny claims he doesn't like the mob business, but he constantly helped Claudia, his sister, in her dealings in the mob world. Johnny and Claudia both had a role in hiring the hit man that put Michael in a coma for a year. Sonny never trusted Johhny, although he did work for him, with supervision.
After Claudia's death, Johnny vowed revenge on Sonny. He testified against Sonny at his trial and accused Sonny of abusing his sister, even though he knew it wasn't true. Later, Johnny used Kristina to try and taunt Sonny. He is constantly sabatoging Sonny's shipments and inciting mob wars.
Johnny is sent to prison.