While union members traditionally march on May 1 for workers' rights in countries around the world, the day has become a rallying point for immigrants in the U.S. since massive demonstrations were held on the date in 2006 against a proposed immigration enforcement bill. Larger crowds are expected to return this year as immigrant groups have joined with Muslim organizations, women's advocates and others in their united opposition to Trump administration policies. In addition to rallies, immigrant rights activists in communities in Indiana, Massachusetts, Texas and elsewhere are calling for strikes to show Americans the demand for immigrant labor and immigrants' purchasing power. Immigrant advocates said they hope their message will reach Trump, congressional lawmakers and the public, as well as provide a sense of unity and strength to those opposed to the administration's policies.