By Simon Lewis

WASHINGTON (Reuters) -Labor unions filed a lawsuit against the U.S. government on Thursday, alleging that the Trump administration violated the First Amendment rights of people who are legally in the United States by searching their social media for specific viewpoints, including criticism of Israel.

The complaint is the latest legal challenge to the broad immigration crackdown initiated since President Donald Trump was inaugurated in January, which has seen unprecedented deportations of migrants, including some who had valid visas.

The Department of State on Tuesday said it had revoked the visas of at least six people over social media comments made about the assassination of conservative activist Charlie Kirk.

Three major trade unions — United Auto Workers, Communicati

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