In 1953, he was arrested by the communists and sentenced to eight years of forced labor for "treason". He was released in 1960. In 1974, he was arrested again and sentenced to another 3 to 5 years, but was released after one and a half.
After the fall of the communist regime, he was an author and head of the international section of the Czech Literary Fund. In 1992, he was elected President of the Czech section of International PEN. He was chairman of the council of the National Library from 1995 to 1998.