Dylann Roof, 21, charged with murdering nine worshippers at a historic black church in Charleston, S.C., in June, listens during court proceedings earlier this month.
Black Lives Matter activists confronted Democratic candidates Martin O'Malley and Bernie Sanders at a Netroots Nation event earlier this month. O'Malley used the phrase "all lives matter" twice, which he later apologized for.
Ross D. Franklin/AP
Wall graffiti at Facebook headquarters in Menlo Park, Calif. The company released a diversity report last month showing that 70 percent of employees are male; African-Americans comprise 2 percent of it workforce.
Robyn Beck/AFP/Getty Images