Supporters staged a sit-in protest after the game - Warrington's sixth defeat in seven matches - and the coach did not attend the post-match press conference.
Labor unions in Greece declared a four-hour strike Friday while in Germany , police broke up a sit-down protest outside the U.S. military's European Command in Stuttgart.
The referral followed a two-day sit-in by the three and their supporters outside the city's prosecution office to protest against what they perceived as stalling over referring the case to trial.