The correct answer is LULAC.
The League of United Latin American Citizens is one of the oldest Latino organization in the United States. It was founded in the year 1929 in Corpus Christi, Texas, during a period of massive discrimination of Hispanic minorities in the States.
The organization initially admitted American citizens only. The goal was to help with assimilation of Latinos into the American society. The belief was that the discrimination was caused by racism which could be overcome by integration and hard work. This way, Mexican Americans could achieve better social and economical status thus fit better into the American society.