Returning to mark Amnesty International's 50th anniversary, The Secret Policeman's Ball 2012 is bigger than ever as some of the world's best comedians and musicians team up for an evening of original, cutting-edge entertainment. This year's Secret Policeman's Ball takes place in March at New York City's Radio City Music Hall, featuring an all-star cast of music and comedy talent. Among the line-up of British and American talent are Coldplay, Russell Brand, Jon Stewart, Stephen Colbert, Mumford & Sons and Reggie Watts.