yù
jiā
zhī
zuì
,
hé
huàn
wú
cí
1
If you want to condemn sb, don't worry about the pretext (idiom, from Zuozhuan 左傳|左传)
2
one can always trump up a charge against sb
3
Give a dog a bad name, then hang him.
4
if you want to punish someone, you can always find excuses