SACRAMENTO, Calif.—State lawmakers passed a bill aimed at curbing fan violence at sporting events, after the brutal attack of Santa Cruz native and San Francisco Giants Fan Bryan Stow.

AB2464 would require professional sports stadiums and arenas to post a phone number for security in parking lots and the stands. The Assembly passed the bill 72-0 Thursday, sending it to the Senate.

Democratic Assemblyman Mike Gatto of Los Angeles said he wrote the legislation in response to a series of high profile incidents of stadium violence. Fans sometimes dial 911 when violence erupts, but the stadium's own security workers can respond more quickly.

The legislation originally called for the nation's first sports "ban list," but was watered down during committee hearings. The original bill sought to block unruly fans from attending professional games anywhere in the state for up to five years.

Stow was brutally beaten outside Dodgers Stadium in March 2011.