13. Evangelos Goussis
Sport: Martial Arts
Criminal History: Drug trafficking, attempted murder, possession of a firearm, two murders
Time Behind Bars: Currently serving a life sentence
The kickboxing champion was convicted of two professional hits and investigated in connection with another murder. Implicated in the 1983 Melbourne Gangland Killings, Goussis was involved in an underground network of criminal figures who began a tit-for-tat, retribution-fueled killing spree that resulted in almost 40 murders.