The Irish Citizen Army (Irish name: Arm Cathartha na hÉireann), or ICA, was a group of trained trade union volunteers established in Dublin for the defense of worker’s demonstrations from the police.

It was formed by James Larkin and Jack White. Other prominent members included James Connolly, Seán O'Casey, Countess Markievicz, Francis Sheehy-Skeffington.

In 1916, The Irish Citizen Army took part in the Easter Rising – aimed at ending British rule in Ireland.

The Starry Plough was the flag of the ICA.

The quote reads: " Only the Irish working class remains as the incorruptible inheritors of the fight for freedom in Ireland" - James Connolly.

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