text:  Many of the residents ' original grievances were addressed with the passing of the Local Government ( Northern Ireland ) Act , 1972 , which <unk> the electoral boundaries and introduced universal adult suffrage based on the single <unk> vote . <unk> were held in May 1973 . Nationalists gained a majority on the council for the first time since 1923 . Since then the area has been extensively redeveloped , with modern housing replacing the old houses and flats . The Free Derry era is commemorated by the Free Derry wall , the murals of the <unk> Artists and the Museum of Free Derry . 
  