they were the muscle for the el rukns. eventually they got prosecuted and a number of them flipped, decided to cooperate. >> one of those cooperators was high-ranking el rukn member anthony sumner. under questioning, sumner soon implicated two fellow gang members in the goon squad murders, earl hawkins and nate fields. sumner claimed nate had openly bragged about the murders. >> he tells nathan, hey, i hear you're involved in that double or that shooting and nathan makes a comment like, yeah, that was a good exercise. >> nate fields was already on law enforcement's radar. >> he's an el rukn since the '60s and committed a prior murder for the organization. >> fields had served 12 years for murder before being paroled. on june 13th, 1985, police arrested him for the goon squad murders. >> i was arrested like 13 months after the crime had happened. i heard one of the cops say, see you in 40 years, nate. i was like, what? i didn't understand that. they took me in for a line-up. >> in the line-up, detective o'callahan instructe