California Constitution,
Art. XIX, Sec. 4 (1879)

nThe presence of foreigners ineligible to become citizens of the United States is declared to be dangerous to the well-being of the State, and the Legislature shall discourage their immigration by all the means within its power. Asiatic coolieism is a form of human slavery, and is forever prohibited in this State, and all contracts for coolie labor shall be void. All companies or corporations, whether formed in this country or any foreign country, for the importation of such labor, shall be subject to such penalties as the Legislature may prescribe.