Twenty of the 23 defendants were medical doctors ( Viktor Brack , Rudolf Brandt , and Wolfram Sievers were Nazi officials ) .
Twenty of the 23 defendants were accused of having been involved in Nazi human experimentation and mass murder under the guise of euthanasia .
Twenty of the 23 defendants were medical doctors ( Viktor Brack , Rudolf Brandt , and Wolfram Sievers were Nazi officials ) , and were accused of having been involved in Nazi human experimentation and mass murder under the guise of euthanasia .