Shaken by a court's decision to acquit George Zimmerman over the shooting death of Trayvon Martin, Alicia Garza wrote, "Black people, I love you. I love us. Our lives matter." From there, the hashtag #BlackLivesMatter was born and then a social movement. It is a world away from the life she had growing up with her mother, stepfather, and brother, where they ran an antique shop in Marin County in San Francisco. Standing firmly in the national spotlight today in a divided America, she is a leading voice in what's widely viewed as America's new civil rights movement.