Sir Oswald Mosley, leader of the British Union of Fascists, marches with his Black Shirts to the East End of London. He and his followers never recovered from what became known as the Battle of Cable Street when they were blocked by the local Jewish and Irish community from forcing a way through their area. Photograph: Getty Images In rejecting the allegation by a powerful Trump ally that the Occupied Territories Bill illustrates how Ireland is heading down an “anti-Semitic path” (Republican Senator Jim Risch), the Taoiseach might be tempted to explain that Irish and American anti-fascists fought together against...