Tensions between his group with the PCR occurred when the former founded itself as a party under the name of
National-Liberal Party (commonly known as the
National Liberal Party-Tătărescu), and, in June-July 1945, proclaimed its goal to be the preservation of property and a
middle class under a new regime. Of himself and his principles, Tătărescu stated:
"I am not a communist. Taking in view my attitudes towards mankind, society, property, I am not a communist. Thus, the new orientation in external politics which I demand for my country cannot be accused of being determined by affinities or sympathies of doctrine."
Speaking in retrospect, Gheorghiu-Dej indicated the actual relation between his party and Tătărescu's: "we have had to tolerate by our side a
capitalist-gentry political group, Tătărescu's group".
Tătărescu himself continued to show his support for several PCR policies: in the summer of 1947, he condemned the United States for having protested against the repression of forces in the opposition. Nevertheless, at around the same time, he issued his own critique of the Groza government, becoming the target of violent attacks initiated by
Miron Constantinescu in the PCR press. Consequently, he was singled out for negligence in office when, during the
kangaroo trial of
Iuliu Maniu (
see Tămădău Affair), it was alleged that several employees of his ministry had
conspired against the government.
Scînteia, the official voice of the PCR, wrote of all National Liberal Party-Tătărescu offices in the government: "The rot is all-encompassing! It has to be removed!".
Tătărescu resigned his office on November 6, 1947, and was replaced by the Communist
Ana Pauker. For the following two months, he was sidelined in his own party by PCR pressures, and removed from its leadership in January 1948 (being replaced with
Petre N. Bejan — the party was subsequently known as
National Liberal Party-Petre N. Bejan). One of his last actions as cabinet member had been to sign the document officially rejecting the
Marshall Plan.
After the proclamation of the
People's Republic of Romania on
December 30, 1947, the existence of all parties other than the PCR had become purely formal, and, after the elections of March 28, the
single-party state was confirmed by legislation. He was arrested on
May 5, 1950, and held in the notorious
Sighet prison (alongside three of his brothers —
Ştefan Tătărescu included — and his former collaborator Bejan). His son Tudor, who was living in Paris, suffered from
schizophrenia after 1950, and had to be committed to an institution (where he died in 1955). Sandra Tătărescu Negropontes was also imprisoned in 1950, and released three years later, upon the death of
Joseph Stalin.
One of Gheorghe Tătărescu's last appearances in public was his stand as one of the prosecution's witnesses in the 1954 trial of
Lucreţiu Pătrăşcanu, when he claimed that the defendant had been infiltrated into the PCR during the time when he had been premier (Pătrăşcanu was posthumously cleared of all charges). Released in 1955, Tătărescu died in
Bucharest, less than two years later. According to Sanda Tătărescu Negropontes, this came as a result of
tuberculosis contracted while in detention.