NEW YORK - MAY 01:  Hundreds of activists, supporters of illegal immigrants and members of the Latino community rally against a new Arizona law in Union Square on May Day on May 1, 2010 in New York City. Following the state of Arizona's passage of a new immigration law which requires individuals suspected of being illegal immigrants to show proof of legal residence when asked by law enforcement, immigration supporters have been protesting across the country. The law has become increasingly divisive, with Mexico's president issuing a travel warning to Mexican citizens in Arizona. Thousands of people are taking part in similar protests around the country on May Day, a traditional day of protest around the world.  (Photo by Spencer Platt/Getty Images)