The co-founder of Amnesty International Ukraine, Marynovych was a founding member of the Ukrainian Helsinki Group.

He worked as a technical editor for the magazine pochatkova shkola (Elementary school) and at publishing house Tekhnika, where he was fired by KGB order.

Eventually, because of their membership, Marynovych and Matusevych were arrested on 23 April 1977, on the charge of "Anti-Soviet agitation and propaganda".

[4][5] There he took part in all human rights actions, held hunger strikes, including a 20-day protest, and narrated a camp chronicle.

After completing his seven years imprisonment in April 1984, Marynovych was exiled to the village of Saralzhin in the Oiyl District of Aktobe region of Kazakhstan, where he worked as a carpenter.

He also worked as a reporter in the local newspaper, Halytska Zorya (The Star of Halych; Ukrainian: Галицька Зоря).

In 1991, his second work was published, entitled Ukraine on the Margins of the Holy Scripture (Ukrainian: Україна на полі Святого Письма).

Among his awards, Myroslav Marynovych received a prize from the journal Suchasnist (“Modernity”) for his political science report “Atoning for Communism” (1993), the Valerii Marchenko award from the Ukrainian-American Bureau for Protection of Human Rights for the best human rights publication (1995), the Vladimir Zhabotinsky Medal for the promotion of inter-ethnic understanding from the Ukraine-Israel Society (1999),[14] the Sergio Vieira de Mello Humanitarian Award (2013),[15] and the Truman-Reagan Medal of Freedom (2014).