Crooks repeat experience turning over scam with shares, principally (9)

I believe the answer is:

evildoers

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'crooks' is the definition.
The definition and answer can be both people as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for evildoers that I've seen is " People acting wickedly".)

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