A massive rift appeared Sunday in the Black Lives Matter movement, when two of its most high-profile activists went at it on Twitter. The beef appears to center on New York Daily News columnist Shaun King's defunct social justice charity, Justice Together. Deray McKesson, a prominent grassroots activist who sat on Justice Together"s board of directors, took King to task for blocking him on Twitter when he asked about the group's planning and financing. Following a Daily Caller expose last month, King announced that he was shutting down Justice Together and returning donations given to it and another similar group...