On this day in 1945, the Soviet Red Army liberated Auschwitz concentration camp in Nazi-occupied Poland, the largest such complex during the Holocaust. In 2005, the United Nations named today as International Holocaust Remembrance Day.
Image: Prisoners being led out of the Auschwitz gates, possibly a re-enactment taken a few weeks after January 27th. The motto "Arbeit macht frei" (English: "Work sets you free") can be seen above the gate. [Wikipedia]
Samuel Gompers, born on this day in 1850, was a founder of the American Federation of Labor, serving as its president for 38 years. Gompers expelled radicals from the AFL, promoted trade unionism, and advocated for racist immigration policies.
On this day in 1923, anarchist miner Kurt Wilckens (1886 - 1923) assassinated Colonel Héctor Benigno Varela after he led government forces that summarily executed 1,500 revolutionary workers in Argentine Patagonia.