树倒猢狲散shù dǎo hú sūn sàn

以势利相结合的人，一旦为首的失势败亡，依附的众徒便随之四散。

例花开蝶满枝，树倒猢狲散。——明·徐渭《雌木兰》

英when an influential person falls from power, his hangers-on disperse; monkeys disperse when the tree falls——members run away when family or institution falls;