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Activists across the United States are gearing up for marches and protests to mark May Day and plan to broaden their message to include issues of police brutality.

Events are being held Friday in cities like New York, Denver, Seattle, Chicago and Portland, Oregon.

May Day has historically been a day when demonstrators rooted deeply in the labor movement call for workers' rights. But in recent years, immigration reform and civil rights issues have been adopted.

This year, marches are planned in support of "Black Lives Matter," a growing movement in the wake of a series of deaths of black men during police encounters. Protests in Philadelphia and Baltimore on Thursday were in support of Freddie Gray, who died a week after police took him into custody.