San Francisco in the late 1930s had 120,000 union members. Longshoremen wore union buttons on their white union-made caps, Teamsters drove trucks as unionists, and fishermen, taxi drivers, streetcar conductors, motormen, newsboys, retail clerks, hotel employees, newspapermen and bootblacks all had representation. Against 30,000 trade union members in 1933–34, Los Angeles by the late thirties had 200,000, even against a severe 1938 anti-picketing ordinance. But Los Angeles became unionized in the mass production industries of aircraft, auto, rubber, and oil, and at the yards of San Pedro. Later, drives for unionization spread through musicians, teamsters, building trades, movies, actors, writers and directors.