State lawmakers are moving to curb anonymous political donations in California after a national election in which nonprofit groups secretly poured hundreds of millions of dollars into campaigns.

Legislators have proposed greater disclosure by donors, higher fines for violations and new powers for officials to investigate suspicious contributions to certain groups. Other measures would boost disclosure requirements for political advertising and campaign websites.

The moves were prompted largely by an Arizona group's $11-million donation this year to a California campaign committee, which used the money to oppose Gov. Jerry Brown's tax-hike measure and support another ballot initiative that was intended to curb unions' political fundraising.