John Castillo was very involved in the Mexican-American movement. He was a member of the Harris County PASO (Political Association of Spanish Speaking Organizations), and was made recording secretary in 1967. Castillo was involved with voter registration and Project VER (Voter Education Registration), which was a project to get people out to vote. They wanted to support politicians who were going to help the Mexican-American community.
Castillo was also a part of various other groups including Opportunities for Leadership Education (OLE), Coalition for Better Government, Raza Unida, Joint Conference of Mexican-Americans, and the National Spanish Speaking Management Association (NSSMA).
From the guide to the John Castillo Papers MSS 208., 1966-1975, (Houston Metropolitan Research Center, Houston Public Library)
