Cameron Recruits US 'Supercop' to Advise on UK Gangs Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Former Los Angeles Police Chief William Bratton walks into the new Police Administration Building after his last press conference on October 28, 2009 in Los Angeles, California. ( David McNew/Getty Images / Getty ) Produced by Posey Gruener Produced by BBC , PRI and WNYC