龙蛇混杂

龍蛇混雜
lóngshéhùnzá
  1. lit. dragons and snakes mingle (idiom)
  2. fig. a mix of good people and scumbags

CEDICT

good and bad people mixed up; wise and unwise huddled together

Wiktionary

比喻愚贤不一的人溷在一起。《红楼梦．第九回》：「人多了，就有龙蛇溷杂，下流人物在内。」《儿女英雄传．第三八回》：「我这座国子监衙门，管着天下十七省龙蛇溷杂的监生。」也作「龙蛇浑杂」、「龙蛇杂处」、「鱼龙溷杂」。

重編國語辭典

Entry Composition

1 龙蛇 lóngshé
  1. men of extraordinary talent
  2. strokes in cursive calligraphy
  3. weapons
2 混杂 hùnzá
  1. to mix
  2. to mingle