Thousands gathered in Union Park Thursday morning before marching to Grant Park for a rally marking May Day, also known as International Workers’ Day, the global holiday commemorating the labor rights movement with roots in Chicago 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.