LL Cool J and Jazmine Sullivan canceled their Philadelphia July 4th concert appearances to support striking municipal workers.

In this life we are only measured by how we uphold our morals and standards, by what we choose to fight for through participation or protest,” she wrote on her Instagram story.

LL Cool J says he won't perform at Wawa Welcome America in Philadelphia until the city and the largest municipal workers' union come to an agreement amid an ongoing strike.