Recruited from the homeless, vagrants and criminals, they became notorious for their undisciplined brutality. Most buildings are open to vagrants and vandals. Karl Denke, for unknown reasons, began murdering homeless vagrants and poor travelers. Recruitment often included trapping vagrants and transients during popular gatherings. These houses held mostly petty offenders, vagrants, and the disorderly local poor. Asocial prisoners ("Asoziale" or Aso), which included vagrants, prostitutes and the Roma, wore black. Existing camps for "vagrants" (homeless persons) were ramped up prior to the 1988 Olympics. This is sometimes in the form of former vagrants becoming established or regular migrants. They included vagrants, adventurers and other reform-minded enthusiasts. These "psychotic vagrants", as some would call them, are gravely misunderstood. Sandhill cranes occasionally reach Europe as vagrants. After the Emancipation Proclamation, the Army conscripted Black "vagrants" and sometimes others. They noted they were occasional vagrants to England, blown there by storms. There are still annual sightings of killer whale vagrants. In Syria, they are winter vagrants and rare residents with some confirmed breeding taking place.