What would be the phrase or proverb or idiom for "A robber is recognized or appreciated by a thief"?
For instance, a jailbird criminal is supported/helped/appreciated/awarded by a corrupt politician or vice versa etc.
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Birds of a feather flock together
Prov. Similar people tend to associate with each other. I always thought Amy was pretentious, and now she's going out with that snobbish boy, Louis. Birds of a feather flock together. George: Why do you think Donald is dishonest? Ned: All his friends are dishonest. Birds of a feather flock together.
Honour amongst thieves or thick as thieves could work or perhaps conspiracy