His most famous publication, I Believed, was a great financial success,[2] created with the help of MI6,[3] with reprints secretly being sponsored by the UK Foreign Office's Information Research Department (IRD) to be used as anti-Soviet propaganda.
[7] He announced his resignation from the newspaper and from the Communist Party of Great Britain in 1948, expressing disillusionment with the Soviet Union's post-war foreign policy.
[9] During this period, his activities received funding from the British Foreign Office's Information Research Department, and I Believed was republished by an IRD front called Ampersand which translated and distributed the book overseas.
[10] He embarked on international anti-communist lecturing tours, and contributed a long-running column to the Catholic Herald newspaper which was syndicated in several countries.
His writings and speeches attracted considerable global attention, I Believed: The Autobiography of a Former British Communist, selling over one million copies in its first ten years of publication.