Toko Kopu, 57, joined the gang aged 15, and rose to become president of an influential Mob chapter.
Life in the gang involved major drug deals, barking like dogs and using Nazi slogans like "sieg heil", he told Daily Mail Australia.
After a period that included robbing a bank and bashing a cop, Kopu traded in his patch for the controversial Destiny Church through its "Man Up" programme, which aims to raise better fathers, brothers and sons.
Young men often turned to crime and gangs because of absent fathers or abuse they suffered, Kopu said.
