助纣为虐: help a tyrant to victimize his subjects; be accessary to a tyrant's crimes; hold the candle to the devil; help the wicked perpetuate wicked deeds
为虎作伥: play the jackal to the tiger; abet one's enemy; act as the paws of the tiger; assist the evildoer; hold a candle to the devil; help an evil man (do evil); help a villain do evil; help the
土豪劣绅的狗腿子为虎作伥欺压百姓: the local bully's henchmen were his agents in oppressing the people
