dirty tricks

☆

Informal unethical or illegal tactics, specif., such tactics used to discredit, harass, etc. one's political opponents

See dirty tricks in American Heritage Dictionary 4

plural noun
Informal

Covert intelligence operations designed to disrupt the economy or upset the political situation in another country.
Unethical behavior, especially acts undertaken to destroy the credibility or reputation of an opponent.
Commercial espionage.

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