Yesterday, something between 20,000 and 50,000 people took to the streets of Manhattanto protest the commercialization of Christmas as part of SantaCon as part of the Millions March NYC, one in a series of ongoing demonstrations against police brutality and systemic injustice in the wake of the Eric Garner and Michael Brown grand jury decisions.

We'll have a full report from the march—which peacefully shut down the Brooklyn Bridge with only one arrest—soon. But first, you can get an idea of just how massive this particular protest was in the aerial timelapse video below. This is what tens of thousands of people marching in unity looks like.