Patrisse Cullors, one of the group’s co-founders, welcomed the award “in solidarity with the organizations and organizers of Australia who had and still have faced oppression.” The social media hashtag with which it shares its name began after neighborhood watch volunteer George Zimmerman was acquitted of killing unarmed teenager Trayvon Martin in Florida in 2013. It gained traction when a police officer fatally shot another unarmed black man, Michael Brown, in Ferguson, Missouri the following year, sparking protests.