Having lost his position with the British Economic Mission in January 1947 when it shut down its operations in Greece, Sheppard returned to Britain and undertook a series of speaking engagements throughout England and Wales on behalf of the League for Democracy in Greece. He addressed the Foreign Affairs Sub-Committee in the
House of Commons in
Westminster. It was on that occasion that he learnt his eye-witness reports on the various
Greek Civil War atrocities submitted to Peck for forwarding to the
Foreign Office had been altered by Peck or someone else to suggest the leftists were to blame and absolving the right-wing forces. Returning to Australia to rejoin his family, Sheppard found himself under attack by conservatives including Adair Macalister Blain, MP, and Major William S. Jordan in
News Weekly, suggesting he was a
Communist. In reply, the Australian Minister for the Army, the Hon. Cyril Chambers confirmed that "Army records do not indicate that this officer has had any official connexion of the nature mentioned". A similar accusation occurred in October 1948 when
Jack Lang, MP declared that Sheppard was a traitor, whose passport should be confiscated. The Australian Minister for Immigration, the Hon.
Arthur Calwell, wrote a letter confirming Sheppard was not a Communist and that his Australian passport remained valid. In a letter 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==