Sofía’s instinct for organizing was a product of her upbringing. Her father was a labor organizer in Arizona and Southern California, starting in the 1930s. “I was born into a lot of activity,” she recalled in 2010. As a freshman, she objected to the fact that there was no Spanish Club at her Campbell high school and won the right to start one by organizing her fellow students. Her desire to make things better for Mexican Americans in East San Jose began after she moved there with her husband and the couple had their son, Willie, and two daughters, Linda and Saundra.
”Before I moved to East San Jose,” Sofía once explained, “I heard that everybody that was bad lived in East San Jose. Everybody that was poor lived in East San Jose. The schools in East San Jose were no good. I never heard anything good about it. Never. When you drove around, without knowing it, just by appearance, what they were saying was true.”
After the sweeping changes at Roosevelt, Sofía gained a greater sense of her own power and began to think about other ways that East San Jose could be improved. Law enforcement had been of great concern to her from the moment she moved there from Campbell.
“I had never seen so many cops driving by,” she said in one 2010 speech. “In a matter of five years, cops had killed 16 people. Of course, most of them were Latino. We had no representation.” In a later interview with Santa Clara University, she recalled: “I saw cops kicking down doors in the Eastside. I saw policemen stopping people for traffic infractions at gunpoint. I saw this with my own eyes, and nobody can say I didn’t see it.”

Sofía channeled her concerns into organizing a march to City Hall that attracted 2,000 protesters, each objecting to what they saw as excessive use of force by San Jose’s Police Department. In 1968, she was key in organizing a Community Alert Patrol (CAP) with a diverse group of other concerned citizens, including members of the Our Lady of Guadalupe Church clergy and Tom Ferrito, who went on to become Mayor of Los Gatos in 1980. It was essentially a sort of Neighborhood Watch — only, instead of keeping an eye out for the activities of criminals, volunteers kept watch over the police instead.