John Acardo appeared in the episode Il Tavolo Bianco. He was a crime boss who would typically put hits on people. He put a hit on Elijah Macey, and he was found not guilty.
As it turns out, he had paid off the Prosecutor Lydia Faulk. She made his charges go away.
John attempted to put a hit out on Jane, but was caught and Lydia was arrested for corruption.