Edmund Sheehy, James Buxton and Buck Farrell were held in Clonmel Gaol, Co Tipperary, Ireland and executed in 3 May 1775. The three men were convicted of the murder of John Bridge and of aiding and assisting the Whiteboys. The Whiteboys sought agrarian reform; they were similar in many respects to the Levellers (and sometimes went by that name) but often used terrorist methods.

A suitable song to sing in commemoration:
THE CONVICT OF CLONMEL aka The Gaol of Cluain Meala by J.J. Callinan, is a translation of the Irish language song "PRÍOSÚN CHLUIAN MEALA"; which in some versions mentions "na Buachaillí Bána", the Whiteboys.
https://mudcat.org/thread.cfm?threadid=10313 thread name: Lyr Add: Clun Malla