Some people dispute the gassings and the presence of gas-chambers at concentration camps.
An epidemic of typhus in KZ Gusen promoted SS doctors to order the dying killed by starvation and heart-injections. No. 16 of KZ Gusen I. These Soviet prisoners were the first to be killed by the experimental closed-barracks gassing. No. 32 of this camp. SS-Hauptsturmfuehrer Fritz Seidler, commander of KZ Gusen, ordered two inmates of Gusen to force the remaining ill people into one baracks and to gas them. There were certainly other gassings at KZ Gusen but, just these few are documented.