BELFAST rappers Kneecap established themselves as a riotous success in their native city and a rising force all over Ireland in the past three years, with a pounding mix of DJ beats and controversial but hilarious politically-charged lyrics, sung in the Irish language. This month, they take their sonic assault to US cinemas with the stateside launch of their self-titled biopic, directed by Rich Peppiatt, shot in Belfast, and starring the rappers, playing themselves, in their acting debut.