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.

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.