He remained active in the management of his parish, but also worked as a high-school teacher and was a prominent figure in the circles of Catholic Action.
[1] He was arrested in May 1951 and sentenced to life imprisonment for alleged espionage for the Vatican and organization of illegal religious activity, in a miscarriage of justice.
He continued in his collaboration with exiles, maintained relationships with foreign visitors, and participated in the preparation of secretly ordained priests and in the organization of theological colloquia at home.
[3] Mádr published the journal Theological Texts (Czech: Teologické texty) from 1978, first as samizdat, then after the Velvet Revolution as a normal revue.
Aside from hundreds of articles, reviews and specialized essays in journals and compilations in the Czech Republic as well as abroad, he published these books: