California Code, Public Resources Code - PRC § 6213

Whenever it appears by final decree of any court of competent jurisdiction that title to any land subject to sale by the State was obtained, or sought to be obtained, by fraudulent means, or in any manner contrary to the laws of this State relating to the acquisition of its public domain, all payments made in the interest of the fraudulent title shall revert to the State without suit. The commission shall thereupon cancel all evidence of title to any such land and shall restore the land to public entry.