"A lot of whiteness started seeping into the forefront. A lot of white voices started seeping into the front." —Devin Boss, BLM leader in Portland, Ore. Leftist coalitions are inherently unstable, so it was only a matter of time before clashes between angry blacks under the banner of BLM started chafing over the prominence of mostly white Antifa radicals. Power, after all, is what motivates the left, and political power is a zero-sum game. Add in the permanent racial resentment animating Black Lives Matter, and the prospects for smooth collaboration between BLM and Antifa decline over time. The violent revolution...