Alfred Frenzel (1899-1968) was a West German member of parliament, who was secretly conducting espionage for Czechoslovakia while serving on the Bundestag’s Defense Committee. Given the code name Anna by the StB, he passed along classified information to the Communist government in Prague for five years, until his arrest in Bonn on October 31, 1960.  He was the most important StB spy during the entire Cold War.
During World War II, after the invasion of his homeland by Nazi Germany, Frenzel worked as an agent for the government in exile in the United Kingdom. After the end of the war, Czechoslovakia became a communist state, and Frenzel emigrated to West Germany.
The new state intelligence service in Czechoslovakia, the StB, examined the files of pre-war intelligence officers, and found information on Frenzel’s pre-war activities. When they discovered that Frenzel had been appointed to the parliamentary defence committee responsible for remilitarising West Germany and establishing her place in NATO, the StB leapt on this opportunity to recruit such a highly placed spy.
2 Espionage activities
In April 1956, an old friend of Frenzel’s visited him in West Germany. He told Frenzel that he was now working for the Czechoslovak government, and offered Frenzel a job. The old friend added that he would expose Frenzel’s political past and criminal record unless he took up the offer. He also said that Frenzel’s wife, who was on a trip to Prague, would be in grave danger if he refused. Intimidated, Frenzel agreed to take the job.
He travelled to Vienna, Austria, which was at the time crawling with StB officers due to its proximity to Czechoslovakia, where he was given 1,500 Deutsche Marks and given the code name Anna. In July, he signed a document indicating his links to the StB.
Frenzel was now trapped, and the StB had enough information to blackmail him unless he did exactly as they said.
Under the close watch of his StB controller, Major Bohumil Molnár, Frenzel returned to West Germany. He began to pass information to Molnár, including a copy of the entire West German defence budget and details of prototype American aircraft.
To reward him for this, the StB gave him a car and a villa back in Czechoslovakia, and also paid Frenzel an enormous salary, placed into a Czechoslovak bank so as not to arouse West German suspicion.
During his time as a spy, the StB’s Tech