Jonathan 'Johnny Sack' Sacrimoni was the underboss (later boss) of the Lupertazzi crime family. Johnny Sack was the right-hand of Carmine Lupertazzi Sr. for many years before he took over as boss following a period of infighting, which led to the deaths of several key figures in Little Carmine's faction, including fellow Lupertazzi caporegime Rusty Millio, shylock Lorraine Calluzzo and Carmine Lupertazzi's former consigliere, Angelo Garepe. Johnny Sack had also been a close friend of Tony Soprano for many years.