In the documentary "Der lachende Mann - Bekenntnisse eines Mörders", Walter Heynowski and Gerhard Scheumann interviewed Siegfried Müller, which, along with other mercenaries, is described in the documentary "Kommando 52" by the same directors.
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By what name was Der lachende Mann - Bekenntnisse eines Mörders (1966) officially released in Canada in English?