After the war Trochta was spokesman of the Czechoslovakian Episcopal Conference in negotiations with the communist government from 1948 to 1949. In 1954, after a two-day trial, the supreme court sentenced him to 25 years in prison for spying for the Vatican. He was named cardinalin pectore in 1969 by Pope Paul VI, and that appointment was published in 1973. He died on April 6, 1974 in Litoměřice.
^Czechoslovakia: crossroads and crises, 1918-88 Norman Stone, Eduard Strouhal 1989 "Bishop Trochta was tried on 22-23 June 1954. Recalling his various period of imprisonment long afterwards among friends, he said: 'Not even in Mauthausen were things so bad. The German concentration camps were not to be compared with ..."