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In 1972, the Brown Berets, a group of Chicano activists, seized and claimed the islands for Mexico, citing the Treaty of Guadalupe Hidalgo, a treaty between Mexico and the USA by which Mexico lost more than half of its territory, and arguing that the treaty does not specifically mention the Channel Islands nor the Farallon Islands.
During this period Tineo spent time working with the Brown Berets, MEChA (Movimiento Estudiantil Chicano de Aztlan) and other community activist groups, and he is still considered one of the most influential leaders of the Chicano Mural Movement in Arizona.
A coalition of students, welfare mothers, Brown Berets, and Immaculate Heart nuns joined to become Católicos por la Raza.