Thousands of workers and immigrant laborers took to the streets yesterday to commemorate May Day, demanding rights for those “who toil in the sun” while others pocket the profits. The message in Manhattan — delivered with bullhorns and drums — more jobs, better working conditions, higher wages and decent health care. May 1 is a traditional date for pro-labor demonstrations. Immigration advocates in the United States latched onto the celebrations in 2006. At dozens of rallies around the country, they vowed to fight on behalf of undocumented immigrants who are being rounded up and deported. “STOP the deportations!” read a placard in Manhattan’s Union Square, where about 1,000 people gathered at noon before marching down Broadway for a rally in downtown Foley Square. The photos were taken at Union Square as the demonstrators began to march down Broadway.