【同恶相济】〖tóng è xing jì〗[conspire with someone in illegal acts; aid and abet each other in wrongdoings; Evildoers collude with each other; take part in a conspiracy with sb]

同类相求臭味凝，

恶直丑正害工农。

相机而动搞复辟，

济度共谋效修正。

坏人互相勾结，共同作恶。Bad people collude with each other, do evil together. 同：狼狈为奸。