It is hard to say which crime committed during the Holocaust was the most gruesome, but along with the Action T4 program, the Action 14f13 is equally horrific. Not because they were worse then all the other atrocities but because elements of both programs are slowly sneaking in by stealth in a number of European countries.
Action 14f13, also called “Sonderbehandlung (“special treatment”) 14f13″, was a campaign of the Third Reich to murder Nazi concentration camp prisoners. Also called “invalid” or “prisoner euthanasia”, the campaign culled the sick, elderly and those deemed no longer fit for work from the rest of the prisoners in a selection process, after which they were killed. The Nazi campaign was in operation from 1941 to 1944 and later covered other groups of concentration camp prisoners, as well.