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.

I’m here in Pennsylvania to tell any member of the Pennsylvania delegation that if they vote for tax breaks for billionaires and cut Medicaid ... we are going to throw them out," Sanders said.