In February 1948, the Communists ended a long process of infiltrating the Romanian Social Democratic Party (ensuring control through electoral alliances and the two-party "Frontul Unic Muncitoresc"—Singular Workers' Front, the PCR had profited from the departure of Constantin Titel Petrescu's group from the Social Democrats in March 1946). The Social Democrats merged with the PCR to form the Romanian Workers' Party ("Partidul Muncitoresc Român, PMR") which remained the ruling party's official name until 24 July 1965 (when it returned to the designation as "Romanian Communist Party"). Nevertheless, Social Democrats were excluded from most party posts and were forced to support Communist policies on the basis of democratic centralism; it was also reported that only half of the PSD's 500,000 members joined the newly founded grouping. Capitalizing on these gains, the Communist government shunted most of the remaining parties aside after the 1948 elections (the Ploughmen's Front and the Hungarian People's Union dissolved themselves in 1953). The PMR fought the elections as the dominant partner of the People's Democratic Front (FND), which won with an 93.2 percent of the vote. By then, however, the FND had taken on the same character as other "popular fronts"in the Soviet bloc. The member parties became completely subservient to the PMR, and had to accept its"leading role"as a condition of their continued existence. Groza, however, remained Prime Minister.