By "did his thing" do you mean the murders? Weren't those committed in Chicago?
However, there was a seamier side of Jaycee life in Waterloo: one that involved wife swapping,[17] prostitution, pornography and drugs. Gacy was deeply involved in many of these activities, and regularly cheated on his wife.[21] In late 1967, Gacy began to abuse teenage male employees of the restaurants he managed.[22] Gacy opened a "club" in his basement, where he allowed employees to drink alcohol before he made sexual advances toward them.[22] One youth was encouraged to sleep with Gacy's wife, then blackmailed into performing oral sex upon Gacy.[22] Several teenagers were conned into believing Gacy was commissioned into carrying out homosexual experiments in the interests of "scientific research", for which the youths were paid up to $50.[23]
Gacy's double life in Waterloo came to a sudden halt in March 1968 when two local boys, aged 15 and 16, accused him of sexually assaulting them.[24] Gacy professed his innocence, but in August of that year he hired another Waterloo youth to physically assault one of his accusers in an effort to discourage the boy from testifying against him. The youth was caught and confessed, and Gacy was arrested.[25] On September 3, Gacy was ordered to undergo a psychiatric evaluation at the Psychiatric Hospital of the State University of Iowa.[20] Two doctors examined Gacy over a period of seventeen days and concluded he was an antisocial personality, unlikely to benefit from medical treatment and whose behavior pattern was likely to bring him into repeated conflict with society.[26] The doctors also concluded he was mentally competent to stand trial.
http://en.wikipedia.org/wiki/John_Wayne_GacyHe clearly had a name established in Waterloo for some nasty shit, this is where it all started.
