After the Communist takeover, he was jailed, but managed to escape the country shortly after the Warsaw Pact invasion of Czechoslovakia in 1968 and settled in Canada.

Between 1929 and 1931, Koch had a sanatorium (cs, sk) designed by his friend, architect Dušan Jurkovič,[3] and surrounded with a garden with 130 species of plants.

[2] In 1939, the Slovak State declared independence and Nazi Germany invaded the Czech lands, establishing the Protectorate of Bohemia and Moravia.

[4] Koch belonged to the Czech anti-fascist group Obrana národa[1] and saved the lives of several Jews from Nazi persecution.

[7] In his book, Koch did not capitalize words such as "germans, germany, hitler, himmler, mein kampf," "ss", and "fürer" [sic].

Following the Prague Spring and the Warsaw Pact invasion of Czechoslovakia, Koch fled the country with his wife and son and settled in Canada.