In addition, he graduated from the Ministry of Light Industry of the Estonian SSR basic preparatory courses for the leading staff in the study plant and was awarded the position of production manager.

[2] Pertmann was one of the signatories of the so-called 20 Tartu Men's Bill "Message to the Estonian Congress - Proposal to Restore the Republic of Estonia", which was published in the newspaper Edasi on February 14, 1990.

Among other things, in February 1955, a few days before the 37th anniversary of the Republic of Estonia, the Kuperjanovs distributed almost 1,000 leaflets in Tartu calling for resistance.

In 1968, 1973, 1978, 1983 and 1988, on the anniversaries of his release from the prison camp, he organized gatherings in the Meeri country house, fomenting anti-Soviet and anti-occupation sentiment.

[6] At the end of the 1970s, on the initiative of Lithuanian dissident Viktoras Petkus, an attempt was made to create an organization uniting the Estonian-Latvian-Lithuanian resistance movements.

[6] Between 1979 and 1984, Pertmann compiled and published an underground almanac, Sotsioloogilised Vihikud (Sociological Booklets), in which he sought to open up and explain historical ideas in Estonia, the Soviet Union, and elsewhere in the world in political, social, and economic terms.