CA Penal Code Section 420

Every person who unlawfully prevents, hinders, or obstructs any person from peaceably entering upon or establishing a settlement or residence on any tract of public land of the United States within the State of California, subject to settlement or entry under any of the public land laws of the United States; or who unlawfully hinders, prevents, or obstructs free passage over or through the public lands of the United States within the State of California, for the purpose of entry, settlement, or residence, as aforesaid, is guilty of a misdemeanor.