群魔亂舞 [－－乱－]

Jyutping kwan4 mo1 lyun6 mou5
Pinyin qún mó luàn wǔ

Definitions (Wiktionary)

phrase, figuratively, idiomatic
rogues of all kinds running wild; evil-doers dominating the stage unrestrained

Definitions (Kaifangcidian)