In Southern California and across the country on Monday, dozens of businesses nationwide closed, schools reported lower attendance and families put off trips to the grocery store in observance of “A day without immigrants.”

The call to action, which began circulating on social media last week, encouraged immigrants to skip work, keep their children home from school and refrain from shopping Monday.

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The national movement is meant to highlight immigrants’ role in the U.S. economy and protest recent anti-immigrant policies from the Trump administration.

According to estimates from the Center for Migration Studies of New York, about 8.3 million undocumented immigrants are employed in the U.S., making up more than 5% of the country’s workforce.

Similar demonstrations were nationwide in 2017 in protest of President Donald Trump’s plans to build a border wall and deport millions of undocumented immigrants.