After the end of World War II, Ogoranu attended classes at the Department of Agronomy, University of Cluj and the Commercial Academy in Brașov. He then became involved in fascist and anti-communist activities in Cluj. For 7 years (1948–1955), he led the anti-communist resistance formation "Grupul Carpatin Făgărășan", consisting of 25–30 members active on the northern slopes of the Făgăraș Mountains. His group tried to establish contact with the resistance formations active on the southern side of the mountains, especially the groups led by Colonel Gheorghe Arsenescu and by Toma Arnăuțoiu, but those overtures were not met with success. For his activities, Ogoranu was sentenced "in absentia" to 19 years in prison and, later, in 1951, to death. In May 1954 he was wounded in a fight with the authorities. In 1955, the Securitate secret police killed or captured several members of his group, either through direct conflict or through denunciations. In 1957, the trial of those captured took place. Ion Chiujdea, Laurian Haṣu, Gheorghe Haṣu, Victor Metea, Nelu Novac, Ion Pop, Olimpiu Borzea, and Nicolae Burlacu were sentenced to death by firing squad; the last two had their sentences commuted to forced labor for life.