 While incarcerated in Mountjoy Prison, Hunter and several others, including Clancy and Frank Gallagher, began a hunger-strike on 5 April, demanding to be treated as Prisoners of War.News of these hunger-strikes sparked general strikes called by the trade unions and large scale demonstrations in Dublin to show support for the hunger strikers.On 14 April 1920, all hunger striking prisoners were released, and Hunter was moved to Jervis Street Hospital.