According to The Wall Street Journal:
California legislators proposed more than a half dozen major bills last year to address the state’s affordable-housing crisis, which researchers say is one of the worst in the nation. None of them passed.
Most of these bills died or were withdrawn due to opposition by unions
According to people involved in the processes, this was largely part to campaigns waged against them by the state’s powerful construction-workers union.
California’s State Building and Construction Trades Council, which represents 450,000 ironworkers, pipe fitters and other skilled laborers, has blocked numerous bills it says don’t guarantee enough work for its members. It contributes tens of millions of dollars to political candidates and campaigns, engages in aggressive lobbying, and pays for advertisements that portray opponents as lackeys of greedy developers. Read more