Karl Hermann Frank (24 January 1898 – 22 May 1946) was a Sudeten German Nazi official in the Protectorate of Bohemia and Moravia prior to and during World War II.

Born in Karlsbad, Bohemia, in Austria-Hungary (present-day Karlovy Vary, Czech Republic), Frank was taught by his father (a proponent of Georg Ritter von Schönerer's policies) about nationalist agitation.

Frank joined and helped organize the Sudeten-German Homeland Front (SdH) in 1933, which officially became the Sudeten German Party (SdP) in 1935.

Coming to represent the most radical Nazis in the SdP, Frank was made Deputy Gauleiter of the Sudetenland when it became part of Germany in October 1938.

[7] As Secretary of State and chief of police, Frank pursued a policy of harsh suppression of dissident Czechs and pushed for the arrest of Bohemia and Moravia's Prime Minister, Alois Eliáš.

Instead, Hitler chose Reinhard Heydrich, and gave him a mandate to enforce policy, fight resistance to the Nazi regime, and keep up production quotas of Czech motors and arms that were "extremely important to the German war effort".

When it came to the population of Lidice, Frank ordered Horst Böhme, the SiPo and SD chief in Prague, to shoot all the men, send all the women to concentration camps, and place those few children considered worthy of "Germanization" in the care of SS families in Germany, with the rest being murdered.

[14] In August 1943, he was made Minister of State for Bohemia and Moravia and was granted cabinet rank and status, but without the formal title of Reichsminister.

They divorced on 17 February 1940 and later that year, Müller married Frank's successor as deputy Gauleiter of Sudetenland, SA-Brigadeführer Fritz Köllner.