Police say they’re hoping the event in a designated protest zone across the street from the convention won’t cause a real battle of Los Angeles.

“We’re gravely concerned because of security reasons, just the large numbers of individuals that this will bring out,” Cmdr. David Kalish said Friday.

Despite the concerns, Kalish said the LAPD doesn’t plan to add more officers to those already scheduled to work the area Monday night. Officers will be given earplugs to deal with the loud music, and Cmdr. Tom Lorenzen, in charge of the city’s convention security detail, said they will “wait, watch and then react.”

Rage Against the Machine’s songs include “Calm Like a Bomb” and “Ashes in the Fall.” It’s Web site encourages civil disobedience to draw attention to societal ills, and the group’s causes include seeking a retrial of convicted cop-killer Mumia Abu-Jamal and opposition to worker exploitation and capitalistic culture.