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.

University of Chicago student Karen Chuchuca thought of her father, an Ecuadorian immigrant who has worked as a truck driver for 25 years, when President Donald Trump signed an executive order earlier this week reinforcing a federal law requiring commercial motor drivers speak English.

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.