"Bathtub Jim" McFly was a brewmaster in Chicago, Illinois in 1927. He was hired by Arnie "Eggs" Benedict to brew his bootleg alcohol. "Mugsy" Tannen and "Battleship" Potempkin, Benedict's muscle men, kept him from leaving.
Marty staged a fake police raid using sound effects with a key ring from 1991. This allowed Doc to get the distilled juniper berries he needed to cure the eye infection from which his dog Einstein suffered. It also allowed Marty to free his relative Jim McFly from being employed by gangsters.