In July 1943 he and several other Bosnian Ulema in the Handschar attended an "Imam Training Course" in Berlin organised by SS Obergruppenführer Gottlob Berger.
The sentence was reduced to 10 years in 1951 because of his refusal to kill The Prominente in Oflag IV-C at Colditz Castle, despite direct orders from Adolf Hitler.
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In 1944 the SS took an interest in General Andrey Vlasov and his Russian Liberation Movement and in summer the head of the SS main leadership office, SS Obergruppenführer Gottlob Berger, specifically appointed Kroeger as a formal liaison officer between Vlasov and the SS.