A massive crowd gathered at City Hall in Philadelphia Thursday for a May Day rally and to see Vermont Sen. Bernie Sanders speak. The "For Workers, Not Billionaires" rally on the north side of City Hall drew a large crowd and shut down streets in the area.

More than 70 demonstrators were arrested in Philadelphia for blocking a highway during a May Day rally that included Sen. Bernie Sanders, who joined local labor unions and activists to protest various issues.

After Sanders’s speech, protesters marched throughout the city and, in some instances, ignored requests by local police to clear the way for rush hour traffic.