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Noun: dirty tricks
  1. Underhand commercial or political behaviour designed to discredit an opponent
    "The campaign was marred by dirty tricks, including spreading false rumours about the candidate"
Noun: dirty trick  dur-tee trik
Usage: informal
  1. An unkind or aggressive trick
    "Spreading false rumours was a dirty trick"

Type of: antic, behavior [US], behaviour [Brit, Cdn], caper [informal], conduct, dido [N. Amer, informal], doings, joke, prank, put-on [N. Amer, informal], trick