History
The Greek-Catholic Church was repressed at various times throughout history, by various groups, and took many forms.

Oppression
In 1948, the Communist regime that had taken power deposed all the bishops of the Greek-Catholic Church and, on October 21st 1948, the 250th anniversary of the Romanian Greek Catholic Union with the Roman Catholic Church, arranged the "spontaneous" passage of all its members (decree 358/1948), who were then some 1,500,000 in numbers, to the Romanian Orthodox Church, to which some of its property, including four cathedrals, were given, while the rest was confiscated by the State.
The Catholic bishops, and many Greek-Catholic priests, were arrested for "undemocratic activity", mainly for refusal to give up ties with the "reactionary" Holy See. In the meantime, the Orthodox Church was "purged" of priests unfriendly to the Communist regime and, for the next 40 years, it had good relations with the Communist authorities.
Iuliu Hossu, Bishop of Cluj, refused the proposal of the Romanian Orthodox Patriarch, Iustinian Marina, to become the Orthodox Archbishop of Iaşi and metropolitan of Moldavia, and thereby even the official successor to the Romanian Orthodox Patriarch himself. He remained under house arrest, and each year sent a memorandum to the President of the Republic, asking that the country's laws and Romania's international agreements be observed with regard to the Romanian Greek-Catholic Church. In 1969, Pope Paul VI asked him to accept appointment to the cardinalate. As he preferred to stay with his people, the Pope made him cardinal only "in pectore", i.e. without publishing the fact, which he revealed only on March 5, 1973, three years after Bishop Hossu's death.
Another remarkable Romanian ecclesiastic of the time was Alexandru Todea (1912–2002). Secretly ordained as a titular bishop on 19 November 1950, he was arrested and sentenced to life imprisonment in the following year. He was given amnesty in 1964 and on March 14, 1990, after the fall of the Communist regime, was appointed Archbishop of Făgăraş and Alba Iulia, becoming a cardinal in the following year.
After more than forty years of surviving only in secrecy and illegally, the Romanian Church United with Rome, Greek-Catholic, was able to appear again in public only after the 1989 Romanian Revolution. Normative act 9/31, passed on 31 December 1989, repealed Decree 358/1948 as repugnant and bringing grave prejudice upon the Romanian State.
With some delay, some of the Church's property, in particular the cathedrals of Cluj, Blaj, Lugoj and Oradea, which the Communist Government had transferred to the Orthodox Church, were restored to it.

Roman Catholic

History of Catholicism in Romania
Byzantine Discalced Carmelites