Marchers carry signs in support of immigrant rights as thousands of protesters march up Broadway during a May Day immigration rally in Los Angeles, California May 1, 2010. Demonstrators at May Day rallies across the nation are focusing on a controversial new Arizona law requiring anyone who may appear to police to be an immigrant to carry documents of proof that he or she is in the country legally, and makes it a crime to be an undocumented immigrant in Arizona. REUTERS/David McNew (UNITED STATES - Tags: SOCIETY POLITICS CIVIL UNREST IMAGES OF THE DAY)