In some countries, it's a public holiday honoring labor, but in the U.S., activists will use the day as a call to action against President Trump's policies.

Chicago was one of hundreds of cities across the country where people took to the streets to mark May Day, a holiday with deep roots in the city’s labor history.

The BriefThousands are expected to march through Chicago today for May Day, demanding workers' rights, immigrant protections and better workplace conditions.The rally begins in Union Park and concludes in Grant Park,