to the News Weekly, Sheppard reiterated that he was "not a Communist but an active Christian and a communicant with the Church of England, an impartial friend of liberalism for 17 years". In 1948 he attended a United Nations Organization peace conference in Paris on the Greek Civil War. He had no diplomatic status but had been deputised to attend by General Markos Vafeiadis, the leader of the rebel Democratic Army of Greece and its Provisional Democratic Government, and authorised to communicate the substance of Markos's peace terms. At the end those peace terms were scuppered by one of Markos's colleagues, Nikos Zachariadis. In the same year, the Athens government accused the rebels of abducting children and sending them abroad for Communist indoctrination. It brought these claims before the Special Commission of the United Nations Organization for the Balkans. Sheppard set about his own fact finding mission, visiting Greek children in camps in Yugoslavia, Romania, Bulgaria, Albania and Hungary, and found the children well cared for and not being indoctrinated and that they had been voluntarily sent there by their parents to avoid the bombing campaigns in Greece. The U.N. General Assembly finally declared in November 1948 that the children had not been forcibly abducted. Sheppard continued to write and hold meetings to alert the Australian and world public to the ongoing crisis in Greece. Following a plea from the Provisional Democratic Government rebels to represent their cause before the U.N., he sailed for Europe in September 1949. However, when he reached Geneva, he found that the position of the rebels had collapsed due to infighting amongst its leaders which undermined their forces on the battlefield. In 1950, finding himself expelled from the League for Democracy in Greece, Sheppard founded a new group, the Committee for Democracy in Greece, through he continued his public meetings on Greece. Bookseller and publisher Sheppard decided not to continue a career in the Army or law, and instead in 1950 he and his wife purchased Morgan's Bookshop at 9 Castlereagh Street, Sydney. That bookshop became "an oasis in excellence of thought" and his many customers included politicians such as William McMahon and H. V. Evatt. Sheppard supported the "No" case against Robert Menzies's 1951 referendum seeking to ban the Communist Party of Australia. During this campaign he found himself arguing against conservative Catholic Action elements in the trade unions and against B. A. Santamaria's