Outraged and saddened after the acquittal of George Zimmerman, the Florida man who killed a Black teenager in 2012, Oakland, California resident Alicia Garza posts a message on Facebook on July 13, 2013. Her post contains the phrase "Black lives matter," which soon becomes a rallying cry and a movement throughout the United States and around the world. Garza said she felt "a deep sense of grief" after Zimmerman was acquitted. She was further saddened to note that many people appeared to blame the victim, Trayvon Martin, and not the "disease" of racism. Patrice Cullors, a Los Angeles community organizer...