Nevertheless , Fukunaga maintains that the characters he chose to portray are inherently likeable people . ` ` ` Sin City '' opens a window on Mexico 's notorious Salvatrucha gangs . Cary Fukunaga 's psychological thriller set against backdrop of immigrant riots on Taiwan . Fukunaga visited gang members in jail and used an immigrant train for research . Film won editing and cinematography awards at 2009 Sundance Film Festival .
` ` Sin City '' opens a window on Mexico 's notorious Salvatrucha gangs . Cary Fukunaga 's psychological thriller set against backdrop of immigrant riots on Taiwan . Fukunaga visited gang members in jail and used an immigrant train for research . Film won editing and cinematography awards at 2009 Sundance Film Festival .