A Co Limerick exile, Mr William Geary, has called on the Government to restore the civil rights of Mr Donal de Roiste, a former Irish Army lieutenant who was dismissed from the Army by President Eamon de Valera in 1969.
Mr Geary, a former Garda superintendent, was born in Ballyagran and spent seven decades in self-imposed exile in the US after being wrongly dismissed by the government in 1928.
Writing to the Limerick Leader, Mr Geary described Mr de Roiste's dismissal as "sordid and obscene".
He believes the brother of Ms Adi Roche, the director of the Chernobyl Children's Campaign, was deprived of his civil rights when he was dismissed without trial.
He said: "As a citizen of a legitimate sovereign state, Lieut de Roiste was deprived of his basic civil rights.
"Even a soldier in the battlefield before being shot for cowardice or rape is accorded a court martial."
Mr Geary, now aged 103, was dismissed by the Executive Council in 1928 following an allegation that he took a bribe of £100 from the IRA.
After protesting his innocence for over 70 years, he was restored to his former rank in 1999 by the then minister for justice, Mr John O'Donoghue.
He said the de Roiste case appeared to centre on the fact that the former lieutenant, who he believed was an honourable man, refused to participate in an alleged cover-up of a drunk-driving incident said to involve another Army officer.
"For a moment consider the option he rejected - promotion in the Army was probably assured.
"From experience I am well aware of the anguish endured by Lieut de Roiste on his callous dismissal from the Irish Army, the injustice, the disgrace inflicted on him and his family.
"He has my sympathy.
"It is incumbent on the Irish Government to demonstrate that injustice shall not be tolerated and basic civil rights held sacred in Ireland," he concluded.