sentences:  Beginning in the summer of 1939 he was one of the leaders of the organization.Together with Josef Mašín and Václav Morávek, Balabán was part of the group known as the Three Kings ("Tři králové"), which carried out intelligence gathering and sabotage.The group continued in communication with Paul Thümmel (agent A-54), a Nazi intelligence officer also working as a spy for Czechoslovakia.