McCabe resigns his Dáil seat on October 30, 1924, along with several other TDs, and the resulting by-election on March 11, 1925, is won by the Cumann na nGaedheal candidate Martin Roddy. He does not stand for public office again and returns to his post as a schoolteacher.
In the 1930s McCabe is involved with the short-lived but widely followed Irish Christian Front (ICF), serving as the organisation’s secretary and announcing its creation to the public on August 22, 1936. He is also a member of the Blueshirts during this period and later the Irish Friends of Germany (later known as the “National Club”) during World War II, a would-be Nazi Collaborator group in the event Germany were to invade Ireland. He chairs their meetings, denies the group is a fifth column and expresses the belief that a German victory will lead to a United Ireland. He is interned in 1940–41 because of his pro-German sympathies, which he claims resulted from the desire to “see the very lifeblood squeezed out of England.”
In 1935, McCabe co-founds the Educational Building Society with Thomas J. O’Connell. He retires from teaching in the 1940s and becomes the full-time managing director of the EBS.
McCabe dies in Dublin on May 31, 1972, leaving his wife, son, and three daughters. There is a bronze bust of him in the headquarters of the Educational Building Society, Westmoreland Street, Dublin.
Higgins returns to Ireland and attends University College Dublin (UCD), studying English and French. For several years he is a teacher in several Dublin inner city schools. While at university he joins the Labour Party and becomes active in the Militant Tendency, an entryistTrotskyist group that operates within the Labour Party. Throughout his time in the Labour Party, he is a strong opponent of coalition politics, along with TDs Emmet Stagg and Michael D. Higgins. He is elected to the Administrative Council of the Labour Party by the membership in the 1980s. In 1989, he is expelled alongside 13 other members of Militant Tendency by party leader Dick Spring. The group eventually leaves the party and forms Militant Labour, which becomes the Socialist Party in 1996.
Higgins speaks out against the Iraq War while a TD, and addresses the Dublin leg of the March 20, 2003 International Day of Action. He is also prominent in the successful 2005 campaign to bring Nigerian school student Olukunle Eluhanla back to Ireland after he had been deported. He remains an opponent of the deportation policy.
Higgins uses his platform in the Dáil to raise the issue of exploitation of migrant and guest workers in Ireland. He and others claim that many companies are paying migrants below the minimum wage and, in some cases, not paying overtime rates. He expresses opposition in the Dáil to the jailing of the Rossport Five in July 2005. He raises the outsourcing of jobs by Irish Ferries in the Dáil in November 2005, requesting new legislation to regulate what he describes as “these modern slavers.”
Higgins is elected again as TD for Dublin West at the 2011 Irish general election. He wins the third seat (of four) with 8,084 first preference votes. In his first speech in the 31st Dáil, he opposed the nomination of Fine Gael‘s Enda Kenny as Taoiseach. On May 4, 2011, Kenny is forced to apologise to Higgins in the Dáil after falsely accusing him of being a supporter of Osama bin Laden after Higgins offers criticism of his assassination by the CIA. He had asked the Taoiseach, “Is assassination only justified if the target is a reactionary, anti-democratic, anti-human rights obscurantist like bin Laden?”
In the Dáil, Higgins accuses TánaisteEamon Gilmore of doing nothing for the 14 Irish citizens being held “incommunicado” by Israel in November 2011. In December 2011, he describes as a disgraceful campaign of intimidation the fines imposed by the government on people who are unable to pay a new household charge brought in as part of the latest austerity budget and says to Enda Kenny that he will be “the new Captain Boycott of austerity in this country.” He asks that Minister for FinanceMichael Noonan provide EBS staff with the 13th month end-of-year payment they are being denied.
In September 2012, Higgins publicly disagrees with former Socialist Party colleague Clare Daly, saying it is “unfortunate” that she has resigned from the party, but that it is impossible for Daly under the banner of the Socialist Party to continue to offer political support to Mick Wallace, who is at that time embroiled in scandal.
Higgins announces in April 2014 that he will not contest the next Dáil election. At the time he states his belief that the “baton of elected representation” should be carried by another generation of Socialist Party politicians — like Ruth Coppinger and Paul Murphy.