On this day, June 10, 1942, Lidice, Czechoslovakia, was destroyed in reprisal for the assassination of Reinhard Heydrich

[Princess Turandot]

1. He was the worst of that particularly evil lot...

although people aren't as familiar with him as they are with the others.

Heydrich was chief of the Reich Security Main Office (including the Gestapo, Kripo, and SD). He was also Stellvertretender Reichsprotektor (Deputy/Acting Reich-Protector) of Bohemia and Moravia. He served as president of the International Criminal Police Commission (ICPC, now known as Interpol) and chaired the January 1942 Wannsee Conference which formalised plans for the "Final Solution to the Jewish question"—the deportation and genocide of all Jews in German-occupied Europe.

He was the founding head of the Sicherheitsdienst (Security Service, SD), an intelligence organisation charged with seeking out and neutralising resistance to the Nazi Party via arrests, deportations, and murders. He helped organise Kristallnacht, a series of coordinated attacks against Jews throughout Nazi Germany and parts of Austria on 9–10 November 1938. The attacks were carried out by SA stormtroopers and civilians and presaged the Holocaust. Upon his arrival in Prague, Heydrich sought to eliminate opposition to the Nazi occupation by suppressing Czech culture and deporting and executing members of the Czech resistance. He was directly responsible for the Einsatzgruppen, the special task forces that travelled in the wake of the German armies and murdered more than two million people by mass shooting and gassing including 1.3 million Jews.
[...]
Heydrich created the "Zentralstelle IIP Polen" unit of the Gestapo to coordinate the ethnic cleansing of Poles in "Operation Tannenberg" and the Intelligenzaktion,[89] two codenames for extermination actions directed at the Polish people during the German occupation of Poland.



https://en.wikipedia.org/wiki/Reinhard_Heydrich#