The SS and police conducted mass actions against civilians with alleged links to resistance movements, their families, and villages or city districts. Notorious killings occurred in Lidice, Khatyn, Kragujevac, Sant'Anna and Oradour-sur-Glane, and a district of Warsaw was obliterated. In occupied Poland, Nazi Germany imposed the death penalty on those found sheltering (or aiding) Jews. "Social deviants"—prostitutes, vagrants, alcoholics, drug addicts, open dissidents, pacifists, draft resisters and common criminals—were also imprisoned in concentration camps. The common criminals frequently became Kapos, inmate guards of fellow prisoners.