Efraim Diveroli

Efraim Diveroli is the deuteragonist/main antagonist in the 2016 biopic film, War Dogs.

He is portrayed by Jonah Hill, who also played Tighten, Donnie Azoff and even himself in This is the End.

Overview
Efraim is the childhood friend of the protagonist, David Packouz (played by Miles Teller). He and David were best friends in high school, but after their parents separated them, he went on to work for his uncle selling guns and eventually started his own company called AEY Inc. A now grown-up Efraim returns to Los Angeles and reunites with David, and offers him a job at AEY, which David agrees to after learning that his girlfriend is pregnant. The two friends go into business together bidding on small-time military contracts and make a fortune off of it.

Eventually, David and Efraim land a 300-million-dollar deal to supply the Afghanistan military with 100 million rounds of AK-47 ammunition. However, as time goes on, Efraim becomes power-hungry and starts betraying people, even going so far as to destroy his partnership agreement with David. When David returns to Miami and severs the partnership, demanding a percentage from The Afghan Deal, Efraim refuses to pay him. At the end of the film, Efraim apologizes to David, but David doesn't believe him. They both get arrested, and Efraim is sentenced to four years in prison.