City and County of San Francisco v. State

After San Francisco (plaintiff) began issuing marriage licenses to same-sex couples and filed suit to have California's opposite-sex marriage statutes declared unconstitutional, the Proposition 22 Legal Defense and Education Fund (Fund) — a group formed roughly a year after voters passed Proposition 22 to help enforce it, whose board included Proposition 22 campaign supporters — moved to intervene in the City's litigation, even though it had also filed its own separate suit challenging the City's actions. The trial court denied intervention, and the Fund appealed.