 These elections were "further evidence of the break-up of the unionist block and the unease among a large section of Protestants about the reform measures introduced under Chichester-Clark".On 30 September 1971, Paisley and Desmond Boal founded the Democratic Unionist Party (DUP).From the 1960s, one of his main rivals was civil rights leader and co-founder of the nationalist SDLP, John Hume.