Rat City Roller Derby | 313 followers on LinkedIn. Founded in April 2004, Rat City Rollergirls, LLC, (RCRG) is Seattle’s (and the Northwest’s) first flat track, all-female roller derby league. RCRG is composed of about 100 member-owners, who are divided among four teams: Derby Liberation Front, Grave Danger, Sockit Wenches, and Throttle Rockets. RCRG’s fifth team, the Rat City Rollergirls All-Stars, is composed of the best players from the four home teams, who represent RCRG in regional and national play.