Patriotism does not necessarily mean that the cause the spy holds dear is related to a nation or the security of a specific nation, as is clearly evident by Voldemort’s Death Eaters. They are against a nation, and indeed, the whole Wizarding world and the world of Muggles. Their cause is Voldemort, or perhaps the desire to obtain power through Voldemort.
Recruitment by: Presumably Voldemort
Incentive Used: Assertion of Wizarding superiority, the opportunity to wreak havoc and assert extraordinary power over Wizards and Muggles alike
Handler: Voldemort or a Death Eater who has a close connection to Voldemort
Method of Communication: Direct assignments from Voldemort, messages sent through another Death Eater, or use of the Dark Mark on the Death Eater’s arm
Sirius: “Well, you don’t just hand in your resignation to Voldemort. It’s a lifetime of service or death” (OP).
Quirrell: “There is no good and evil… there is only power, and those too weak to understand it… Since then, I serve him faithfully, although I have let him down many times.” (SS)
When Voldemort returns at the end of Harry Potter and the Goblet of Fire, you can see exactly what kind of relationship Death Eaters have with their handler, Voldemort. The Dark Lord demands loyalty and disappointing him is dangerous to say the least.
The first blog post in the Spies Among Us series was about Mundungus Fletcher, a Spy for Hire.