Mann was one of the few publicly active opponents of Nazism among German expatriates in the U.S. In a BBC broadcast of 30 December 1945, Mann expressed understanding as to why those peoples that had suffered from the Nazi regime would embrace the idea of German collective guilt. But he also thought that many enemies might now have second thoughts about "revenge". And he expressed regret that such judgement cannot be based on the individual. Last years With the start of the Cold War, he was increasingly frustrated by rising McCarthyism. As a "suspected communist", he was required to testify to the House Un-American Activities Committee, where he was termed "one of the world's foremost apologists for Stalin and company". He was listed by HUAC as being "affiliated with various peace organizations or Communist fronts". Being in his own words a non-communist, rather than an anti-communist, Mann openly opposed the allegations: "As an American citizen of German birth, I finally testify that I am painfully familiar with certain political trends. Spiritual intolerance, political inquisitions, and declining legal security, and all this in the name of an alleged 'state of emergency'. ... That is how it started in Germany." As Mann joined protests against the jailing of the Hollywood Ten and the firing of schoolteachers suspected of being Communists, he found "the media had been closed to him". Finally, he was forced to quit his position as Consultant in Germanic Literature at the Library of Congress, and in 1952, he returned to Europe, to live in Kilchberg, near Zürich, Switzerland. He never again lived in Germany, though he regularly traveled there. His most important German visit was in 1949, at the 200th birthday of Johann Wolfgang von Goethe, attending celebrations in Frankfurt am Main and Weimar, as a statement that German culture extended beyond the new political borders. Death Following his 80th birthday, Mann went on vacation to Noordwijk in the Netherlands. On 18 July 1955, he began to experience pain and unilateral swelling in his left leg. The condition of thrombophlebitis was diagnosed by Dr. Mulders from Leiden and confirmed by Dr. Wilhelm Löffler. Mann was transported to a Zürich hospital, but soon developed a state of shock. On 12 August 1955, he died. Postmortem, his condition was found to have been misdiagnosed. The pathologic diagnosis, made by Christoph Hedinger, showed he had actually suffered a perforated iliac artery aneurysm