 Complete the following phrase:  In December 2012, Beyoncé along with a variety of other celebrities teamed up and produced a video campaign for Demand A Plan, a bipartisan effort by a group of 950 U.S. mayors and others designed to influence the federal government into rethinking its gun control laws, following the Sandy Hook Elementary School shooting. Beyoncé publicly endorsed same-sex marriage on March 26, 2013, after the Supreme Court debate on Californias Proposition 8. She spoke against North Carolinas Public Facilities Privacy  Security Act, a bill passed and later repealed that discriminated against the LGBT community in public places in a statement during her concert in Raleigh as part of the Formation World Tour in 2016. She has also condemned police brutality against black Americans. She and Jay-Z attended a rally in 2013 in response to the acquittal of George Zimmerman for the killing of Trayvon Martin. The film for her sixth album Lemonade included the mothers of Trayvon Martin, Michael Brown and 