The Áron Márton Memorial Collection in Alba Iulia contains the materials that represent the most complete coverage of the bishop’s life and activity, which offers countless proofs of individual courage and spirit of sacrifice, in the light of his official and private correspondence carried on with the Holy See, the Romanian public authorities, and private persons, and insight not only into his struggle for the survival of the Church and the Catholic faith, but also into the details of the fight for minority and human rights in the twentieth century.