Google cofounder Sergey Brin has poured $102 million into the fight against a proposed one-time tax on California's billionaires, a levy that could cost him about $13 billion if voters approve it in November.
According to a Fortune report citing campaign filings, Brin has given the money to Building a Better California, a political action committee and advocacy group that opposes the tax and backs pro-business policies and housing and infrastructure affordability.
