1974 Arrest of Gunther Guillaume
40 years ago, on April 24, 1974, Günter Guillaume, a personal assistant to German Chancellor Willy Brandt, was arrested in Bonn, who turned out to be a long-term staff member of the Ministry of State Security of the GDR. Brandt voluntarily resigned two weeks later. Despite the fact that the German security services had evidence against the Guillaumes back in mid-1973, almost a year passed before their arrest. Guillaume immediately confessed to espionage.