There's no real evidence that Robespierre was a freemason, or member of one of the many sects or societies of the day. Unfortunately
O'Connell it seems was; Prior to his reversion to catholicism, he joined the Masonic Order in 1797 it appears to have brought him into contact with United Irish leaders like Emmet and may have influenced his membership of the United Irishmen; there are clear affinities between the view he expressed in 1796 that the Irish people as a whole were not ready for liberty and Emmet’s leadership of the conservative section of the United Irishmen, who thought a rising should only be attempted when a French army arrived to ensure military victory and restrain popular excess. Apparently his support of the Enlightenment movement influenced his relationship with Masonry.
His Masonic career outlasted the revolutionary period; he belonged to different lodges in Dublin (latterly as master), Tralee and Limerick, and served as counsel to the grand lodge. Although he was not
formally expelled until 1837, he had ceased to be active many years previously because of his reviving Catholic belief and renewed Papal condemnations.
King Dan: the Rise of Daniel O’Connell, 1775-1829 by Patrick MGeoghegan
(Geoghegan dates his departure at around 1816.)