On 20 March 1941 Kajpr was arrested for writing “seditious” and “spiteful” articles against the Reich. First, he was imprisoned in Pankrác and later in the Terezín concentration camp which included a “break” while working in a group that reconstructed a building and garden in Nová Huť (now Nižbor) near Beroun for the recreation of the Gestapo members.
