Labor unions and civil rights groups staged May Day rallies in several U.S. cities on Monday to denounce President Donald Trump's get-tough policy on immigration, a crackdown they said preys on vulnerable workers in some of America's lowest-paying jobs.

Protests and marches challenging Trump's efforts at stepping up the deportation of illegal immigrants drew crowds by the thousands to the streets of New York, Washington, Los Angeles and San Francisco, with smaller gatherings popping up across the country.

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