In 1939, the Nazis began a “euthanasia” program in which 100,000 Germans who were disabled or mentally retarded were murdered.

The program was based in Berlin at No. 4 Tiergartenstrasse and became known as the T-4 program.

In 1939, the Nazis began a “euthanasia” program in which 100,000 Germans who were disabled or mentally retarded were murdered.