Karl Gröger (German: [kaʁl ˈɡʁøːɡɐ] ⓘ; 7 February 1918 - 1 July 1943) was a member of a Dutch resistance group executed in 1943.

Karl Sr. studied law and became a high profile attorney in Viennese society, sometimes representing men who would later become known Nazis during the Third Reich.

Unbeknownst to the Germans, Karl (Bubie as he was known to friends and Munkie as he was known to his parents), was the product of a full Jewish mother (who converted into the Catholic faith in 1911) and of a half-Jewish father.

Gröger joined the resistance movement of Gerrit van der Veen, a sculptor.

Following the 1940 German invasion and occupation of the Netherlands, everyone aged 15 and older was required to carry an identification card, the persoonsbewijs, with them at all times.

[2][4][3] In 1943, a group of resistance members, led by sculptor Gerrit van der Veen and painter and author Willem Arondeus, meticulously planned to carry out a sabotage attack on the Amsterdam civil registry office, with the aim to destroy the records, without causing any loss of life.

[2] The mission was particularly difficult because security at civil registries had been tightened up after a similar assault on an office in Wageningen in late 1942.

Through this act, thousands of file cards of Dutch people who would have been deported to concentration camps were destroyed.

The assault on the civil registry office at Plantage Kerklaan 36, a former concert hall directly adjacent to the main entrance of Artis zoo, took place on the night of 27 March 1943.

Disguised in police uniforms, the resistance group approached the security guards and told them that they had come to search the building for explosives.

[2][4][5][6][3] Once inside the building, the resistance members pulled open all the drawers, piled all of the documents onto the floor and doused them with benzene.

Because a mercy petition was refused by SS Reichsführer Heinrich Himmler, Gröger was executed with several of his companions in the dunes near Overveen.

Gröger told his lawyer that he hoped his actions would serve to establish a better relationship between the Netherlands and Germany.

( Original source Family documents, letter from Gestspo prison to his parents,)[citation needed][7]