After German occupation in March 1939, a number of high-ranking Czech officers formed the underground military organization Obrana Naroda (ON: Defense of the Nation). For a long time, the Czech administration of the “protectorate” also maintained close contact with the government-in-exile under Edvard Benes in London, providing them with information and arranging the escape of volunteers to join the Czech units fighting with the Allies.
For a time, the ON intelligence service managed to infiltrate entire institutions in the protectorate’s administration. In 1940/41, ÜVOD (Center of the Domestic Resistance Movement) began coordinating the various underground resistance organizations’ activities.
As the “Reich Protectorate of Bohemia and Moravia” was subject to German law, the “People’s Court” passed death sentences for hundreds of Czech resistance fighters from all political groups. More than 600 of them were murdered in Plötzensee prison alone.