Carl Værnet

Carl Vaernet (born: April 28, 1893 in Copenhagen, Denmark, died on November 25, 1965, Buenos Aires, Argentina) was a doctor in the Buchenwald concentration camp. He is infamous for doing barbaric medical experiments on gay prisoners. The these crimes were hidden from history for over 50 years. 
With help from the British military, he was not put on trial at Nuremburg. He escaped to Argentina where he is known to have lived openly until his death in 1965.