Workers around the world mark May Day with rallies for better working conditions

Demonstrators across the globe seized May Day, also known as International Workers' Day, as a moment to celebrate working-class contributions as they rallied for better labor rights, immigration overhauls, and other causes around social and economic equality.

Crowds of activists marched through lower Manhattan to demand worker protections and immigration overhauls on Sunday.

Local chapters of labor organizations affiliated with the AFL-CIO held a "United Against Union Busting" march and rally that kicked off at Union Square. Stopping points on the march's route included a Starbucks Roastery, a Whole Foods and a penthouse owned by Starbucks CEO Howard Schultz.