"We study history. Those of us who glamorize the great old days without acknowledging on whose backs that greatness was achieved do a disservice to the present and the future. And for those of us fighting for justice, there are several playbooks and source code repositories left behind by abolitionists, trade unionists, feminists, artists, prisoners, and more. History is not a circle, but more probably a spiral, in which we revisit similar but not exact coordinates from the past. We should revisit that past and prepare for the troubling times ahead."