In the 1920s, the company had ties to the liberal nationalist German People’s Party and was accused by the Nazis of being an “international capitalist Jewish company”.[8] A decade later, it was a Nazi Party donor and, after the Nazi takeover of Germany in 1933, a major government contractor, providing significant material for the German war effort. Throughout that decade it purged itself of its Jewish employees; the remainder left in 1938.[9] Described as “the most notorious German industrial concern during the Third Reich”,[10] in the 1940s the company relied on slave labour from concentration camps, including 30,000 from Auschwitz,[11] and was involved in medical experiments on inmates at both Auschwitz and Mauthausen.[12][13] One of its subsidiaries supplied the poison gas Zyklon B, which killed over one million people in gas chambers during the Holocaust.[c][15]

I learned a decent bit about WW2 in school but this bit was totally glossed over. Pretty big oversight since they were the source of the gas…

Wow, now come to think of it, trying to incinerate such an individual makes for some great irony