From 1955 to 1966, he served as President of State Committee for Nuclear Energy, and was (1962–1969) Vice-president of the Ministerial council, as well as Minister of Metallurgy, Mining, Chemistry, Transport and Telecommunications, Building, Chemical Industry, and National Trading.
In 1963, after attending John F. Kennedy's funeral, he established diplomatic relations with the Western world, including the United States.
[citation needed] Those steps were highly encouraged by the United States government and US President Lyndon B. Johnson, and gained Romania a privileged communist country status.
From 1969 to 1982, Marin was President of the Pricing Committee, until being removed from official positions by Ceaușescu, being by far the last Gheorghiu-Dej supporter to be eliminated from the Romanian government.
According to ‘witnesses’, the PCF broke relations with the MOI and dislocated in various regions MOI cadres with a view to paralysing their activity...The protagonists with such opinions do not know or forget the strict rules of illegality, the necessity to break links in order to prevent, via filature, the pursuit and fall of a part of or all of an organisation.
The absence of Holban from the leadership of the FTP-MOI in the Paris region, during a period when he asked to be moved to another region, has been used in a wide press, television and cinema campaign to tarnish this hero of the Resistance, making him responsible for the fall and execution of the Groupe Manouchian, when the culprit was the traitor Davidowicz, condemned and executed by the Resistance.
"[5] He had three, or more, children: Ileana, Jackie (married to Radu Osman, emigrated to Israel), and son Minu (physicist at MIT, born in France, deceased).