The Greaser Act was an anti-Mexican law enacted in 1855 in California, thinly disguised as an anti-vagrancy statute. The law defined a vagrant as "all persons who are commonly known as 'Greaser' or the issue of Spanish and Indian blood... and who go armed and are not peaceable and quiet persons." The law was repealed a few years later.
California Statutes Chapter 175 (1856), available at http://22.214.171.124/clerkarchive/
A Different Mirror (pp. 178, 457 fn. 32), by Ronald Takaki, Little Brown & Co. (1993)
Faultlines: The Historical Origins of White Supremacy in California (pp. 57, 228 fn. 36), by Tomas Almaguer, University of California Press (1994)