Ivan Averill Cooper ( 5 January 1944 – 26 June 2019 ) was a politician from Northern Ireland who was a member of the Parliament of Northern Ireland , and a founding member of the SDLP . He is best known for leading an anti-internment march which developed into the Bloody Sunday massacre on 30 January 1972 , in Derry , County Londonderry , Northern Ireland
Bloody Sunday massacre
Bloody Sunday (1972)
Ivan Cooper