Despite his shaky status Krogmann, a devotee of the writings of Richard Wagner, Paul de Lagarde and Houston Stewart Chamberlain, was a staunch believer in Nazism, especially its antisemitic aspects and rigorously enforced anti-Jewish laws within Hamburg whilst publicly speaking in support of them elsewhere.
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He further acted as the apologist of Judaism in a pamphlet against Lagarde (Prof. Paul de Lagarde, nach Seiner Natur Gezeichnet, 1887), who denounced all Jewish scholars as dilettanti; and when the blood accusation was revived, he republished (1888) the opinion of Cardinal Ganganelli—afterward Pope Clement XIV—to prove the falsity of this charge.