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.

Thousands marched through Chicago today for May Day, demanding workers' rights, immigrant protections and better workplace conditions. The rally began in Union Park and concluded in Grant Park, with speeches from labor leaders, immigrants, and elected officials.

Railing against “tax breaks for billionaires” and issuing a warning to Pennsylvania lawmakers, Sen. Bernie Sanders delivered a firebrand speech Thursday afternoon to a crowd clustered outside City Hall.