Illegal agreement
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An illegal agreement, under the common law of contract, is one that the courts will not enforce because the purpose of the agreement is to achieve an illegal end. The illegal end must result from performance of the contract itself, however. A contract that requires only legal performance, such as the sale of packs of cards to a known gambler, where gambling is illegal, will nonetheless be enforceable. A contract to pay a gambling debt, however, will not.
A famous example in the United States is Bovard v. American Horse Enterprises 247 Cal. Rptr. 340 (1988), in which the California Supreme Court refused to enforce a contract for payment of promisory notes used for the purchase of a company that manufactured drug paraphernalia.
In Canada, one cited case of lack of enforceability based on illegality is Royal Bank of Canada v. Newell, 147 D.L.R (4th) 268 (N.C.S.A.), in which a woman forged her husband's signature on 40 cheques, totalling over $58,000. To protect her from prosecution, her husband signed a letter of intent prepared by the bank in which he agreed to assume "all liability and responsibility" for the forged cheques. However, the agreement was unenforceable, and struck down by the courts, because of its essential goal, which was to "stifle a criminal prosecution." Because of the contract's illegality, and as a result voided status, the bank was forced to return the payments made by the husband.
Contracts in restraint of trade are a variety of illegal contracts and generally will not be enforced unless they are reasonable in the interests of the contracting parties and the public.