The streets of Los Angeles are packed with the sights and sounds of collective action this week. Braving the cold rain, some 30,000 United Teachers Los Angeles (UTLA) members turned out for picket lines across the city yesterday, joined by more than 10,000 parents, students and community members. Every L.A. school site—more than 900—participated in the strike, culminating in a 50,000-person march to the Los Angeles Unified School District’s (LAUSD’s) headquarters.