In reality, they're not spies; they're [1] collaborators. From the [2] Washington Times, with thanks to Jeffrey Imm:

BAGHDAD -- Al Jazeera television yesterday aired a video of four aid workers kidnapped over the weekend, apparently being held by a previously unknown terrorist group called the "Swords of Righteousness."

The four -- two Canadians, an American and a Briton, members of Christian Peacemaker Teams (CPT) -- sat with their backs against a wall, and looked calm.

A taped statement by the terrorists accused the four of being "spies of the occupying forces." Previous hostages charged with being spies have been beheaded or shot.