This is what the MEChA Constitution says (Article II, section 1):
"General membership shall consist of any student who accepts, believes and works for the goals and objectives of MEChA, including the liberation of AZTLAN, meaning self-determination of our people in this occupied state and the physical liberation of our land."
From ""El Plan de Aztlan": In the spirit of a new people that is conscious not only of its proud historical heritage but also of the brutal "gringo" invasion of our territories, we, the Chicano inhabitants and civilizers of the northern land of Aztlan from whence came our forefathers, reclaiming the land of their birth and consecrating the determination of our people of the sun, declare that the call of our blood is our power, our responsibility, and our inevitable destiny.
From the Hoover Institute:
Thus Rodolfo Acuña's Occupied America claims the Southwest for Mexicans. Chicano activists (Chicanismo) push not only for civil rights for illegal Mexicans but also for the return (reconquista) of the lost provinces to form Aztlán. Chicanismo demands Spanish language and culture education, not English or American cultural schooling. The Movimiento Estudiante Chicano de Aztlán (MECHA) in 1970 formed a political party, La Raza Unida, won control of Crystal City, Texas, and tried to make it into a Chicano city. The party split and has had little political impact since but could easily revive in California or Texas.
"People of the Sun", "Aztlan"? Well, I tried to search for "aztlan" on Google I found http://aztlan.net . Quite instructive.