Question: What crime is Gary Ridgway associated with? 
Sentence (from "Sex Workers Outreach Project USA"): The organization was founded by Robyn Few on August 13, 2003, and their first major action was to organize the first annual International Day to End Violence Against Sex Workers (December 17) with the Green River Memorial for the victims of Gary Ridgway, the "Green River Killer."
Relevant evidence: Yes