Jabarkan Merten affair dari Konstantinos Karamanlis

Max Merten was Kriegverwaltungsrat (military administration counselor) of the Nazi German occupation forces in Thessaloniki. He was convicted in Greece and sentenced to a 25 year term as a war criminal in 1959. On 3 November of that year, Merten benefited from an amnesty for war criminals, and was set free and extradited to the Federal Republic of Germany, after political and economic pressure from West Germany (which, at the time, hosted thousands of Greek economic immigrants). Merten's arrest also enraged Queen Frederica, a woman with German ties, who wondered whether "this is the way mister district attorney understands the development of German and Greek relations".

In Germany, Merten was eventually acquitted from all charges due to "lack of evidence." On 28 September 1960 German newspapers Hamburger Echo and Der Spiegel published excerpts of Merten's deposition to the German authorities where Merten claimed that Karamanlis, the then Minister for the Interior Takos Makris and his wife Doxoula (whom he described as Karamanlis's niece) along with then Deputy Minister of Defense George Themelis were informers during the Nazi occupation of Greece. Merten alleged that Karamanlis and Makris were rewarded for their services with a business in Thessaloniki which belonged to a Greek Jew sent to the Auschwitz concentration camp. He also alleged that he had pressured Karamanlis and Makris to grant amnesty and release him from prison.

Karamanlis rejected the claims as unsubstantiated and absurd, and accused Merten of attempting to extort money from him prior to making the statements. The West German government also decried the accusations as calumniatory and libelous. Karamanlis accused the opposition party of instigating a smear campaign against him. Although Karamanlis never pressed charges against Merten, charges were pressed in Greece against Der Spiegel by Takos and Doxoula Makris and Themelis, and the magazine was found guilty for slander in 1963. Merten did not appear to testify during the Greek court proceedings. The Merten Affair remained at the centre of political discussions until early 1961.

Merten's accusations against Karamanlis were never corroborated in a court of law. Historian Giannis Katris, an ardent critic of Karamanlis, has argued that Karamanlis should have resigned the premiership and pressed charges against Merten as a private individual in German courts, in order to fully clear his name. Nonetheless, Katris rejects the accusations as "unsubstantiated" and "obviously fallacious".