Spies were not treated kindly within their regime. To uncover one was a brutal, disgusting business. In the early days, spies were everywhere. One never knew when they could trust a person or not. Even families were often caught in the middle. The Weasleys were a perfect example. Half were for Lord Voldemort and half were vehemently against. A single wrong word in front of the wrong family member or once-trusted friend could find someone in the middle of an interrogation with the likes of Rabastan Lestrange or Hermione herself. Certainly not a place anyone would want to be if it could be avoided.