Organizers of this year's May Day immigrants' rights march in downtown Los Angeles claim up to 50,000 people will take part.
LAPD Deputy Chief Jose Perez said police will be out in force but plan to keep a low profile and keep the march peaceful.
About 50,000 people marched last year for federal immigration law reform in the wake of Arizona's crackdown on illegal immigration.
During a gathering in MacArthur Park after the 2007 May Day march, more than 40 people were hurt when police used batons and rubber bullets to disperse the crowd. The LAPD acknowledged mishandling the operation and the city paid millions to settle lawsuits.
Copyright The Associated Press
