The movie star admits his wife was unhappy about his involvement with the project, which was to be a fictional account of the unruly family gang members' clashes with New South Wales authorities almost two decades ago.
Crowe tells WENN, "I stepped away from that. It's not something my wife is comfortable with me approaching."
The actor was inspired to develop the project after watching 2007 documentary Bra Boys: Blood is Thicker Than Water, which was written and directed by members of the gang.
He adds, "Whatever was encapsulated in that documentary is not really the full story and the longer you wait the more things happen. I wasn't actually directly attached to the film, but my involvement helped the producers get their own idea off the ground."