 Nyora kupfuurira kweiyi ndima - Hamann akanga ari wevabereki veBaltic German. Akadzidziswa kuva kemisiti, akanga ane zvinetso kuwana basa nemhaka yeDzvinyiriro Huru. Akabatana neSA muna August 1931, Nazi Party muna December 1932, uye SS muna July 1938. Akashanda muLuftwaffe panguva yekupinda kwePoland uye Hondo yeFrance separatrooper Fallschirmjäger. Akadzokera kuBerlin uko akabatana neSS ndokupedza makosi okudzidzisa. Muna March 1941, akasimudzirwa kuva SS-Obersturmführer mutungamiri wokutanga. Pashure pokupinda kweNazi muSoviet Union, Hamann akaronga uye akatungamira Rollkommando Hamann iyo yakauraya maJuda anosvika zviuru makumi matatu nezvipfumbamwe munzvimbo dzakasiyana siyana muLithuania uye vanhu zviuru mazana mapfumbamwe nemazana maviri, vangangoita vese vaive maJuda, kubva kuDaugavpils Ghetto. Mukuru mukuru waHaman, Karl Jäger, akanyora kuuraya uku muJäger Report. Kunyanguvezvo, Martin C. Dean anofungidzira nhamba yavakaurawa naRollkommando Hamann kuva vaJudha vanofungidzirwa kuva 60 000 muLithuania moga. 