Who wore which patches in the death camps?

Answer 1

I found this in Wikipedia.

Single triangles

• Red triangle---political prisoners: liberals, communists, trade unionists, royalists, social democrats and socialists, Freemasons, anarchists.
• Green triangle--- "professional criminals" (convicts, often Kapos, serving in exchange for reduced sentences or parole).
• Blue triangle---foreign forced laborers, emigrants.
• Pink triangle---sexual offenders, mostly homosexual men but rarely rapists, bestiality, and pedophiles.[2]
• Purple triangle--- Bible Students, a term taken from a name of, and primarily referring to, Jehovah's Witnesses, though a very small number of pacifists and members of other religious organizations were also imprisoned under this classification
• Black triangle---people who were deemed "asocial elements" and "work shy" including
  • Roma (Gypsies), who were later assigned a brown triangle
  • The mentally ill
  • Alcoholics
  • Vagrants and beggars
  • Pacifists
  • Conscription resisters
  • Prostitutes[3][4][dead link]
  • Some anarchists
  • Drug addicts
  • Lesbians
• Brown triangle---Roma (Gypsies) (previously wore the black triangle).[5]
• Un-inverted red triangle---an enemy POW, spy or a deserter.

People who wore the green and pink triangles were convicted in criminal courts and may have been transferred to the criminal prison systems after the camps were liberated.

Source: Wikipedia; Nazi Concentration Camp Badges.