History

In 1935-36, individual commanders of various concentration camps began forcing newly admitted groups of prisoners to wear badges indicating the alleged grounds for their incarceration. Starting in the winter of 1937-38, these classification symbols were standardized for all camps. Additionally, colors were introduced to differentiate different prisoner groups: example: red for political prisoners, green for criminals, blue for emigrants, purple for Jehovah’s Witnesses, pink for homosexuals, and black for “asocials” [Asoziale] or “work shirkers” [Arbeitsscheue]. Inmates wore triangles of fabric in the assigned color on their prison uniforms (left side of the shirt, right pant leg) along with their number and any required additional markings (e.g., potential escapee). Jewish prisoners also wore a yellow triangle that formed a Star of David when placed over the other badge The origin of non-German prisoners was indicated by the first letter of the German name of their native country (e.g., “P” for Polen [Poland] or “T” for Tschechoslowakei[Czechoslovakia] ). The cynical social Darwinist classification and hierarchical ranking of the prisoners by the SS intensified the competition among prisoners in the daily struggle for survival.

Source: wikipedia |  ghi-dc

Dr. Leo Stanley

Dr. Leo Stanley served as a chief surgeon for nearly four decades. Between 1919 and 1922, Dr. Leo Stanley injected 656 prisoners at San Quentin Prison.  Stanley would take the testicles out of executed prisoners and surgically implant them into living prisoners. In other experiments, he attempted to implant the testicles of rams, goats, and boars  into living prisoners. Stanley also performed various eugenics experiments, and forced sterilization  

on San Quentin prisoners Stanley believed that his experiments would rejuvenate old men, control crime (which he believed had biological causes), and prevent the "unfit" from reproducing.

Source: ianshul | wikipedia