成群结党

Explanation: See "into the cluster of the party." 　　Source: Guo, "Study of Ancient China," Chapter II, but this second one is wily and mischievous, gangs, many of the groups of partisans. " 　　Examples: You ~'s doing here? ★ Mao Dun "Midnight" Eighteen Thesaurus:  Into a cluster of the party