A term used to describe criminal antitrust conduct (the crime committed by the criminal defendants).
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a secret agreement between two or more parties to deny another party their rights, to defraud another party or to gain an advantage over another party with whom you are negotiating
At least seven former detainees are now alleging British collusion in their mistreatment abroad. The Office of Fair Trading had alleged collusion on pricing, price rises and arrangements not to compete.