California Code
ARTICLE 3 - Offenses Against the Chapter
Section 17045.

17045. The secret payment or allowance of rebates, refunds, commissions, or unearned discounts, whether in the form of money or otherwise, or secretly extending to certain purchasers special services or privileges not extended to all purchasers purchasing upon like terms and conditions, to the injury of a competitor and where such payment or allowance tends to destroy competition, is unlawful.

(Added by Stats. 1941, Ch. 526.)