What is the collective noun for kidnappers?

There isn't a widely accepted or common collective noun for kidnappers.

Here are a few possibilities, though none are particularly standard:

* A clutch of kidnappers (this is used for birds, but could be applied here metaphorically)

* A band of kidnappers (referring to a group of criminals)

* A ring of kidnappers (emphasizing a network or organization)

Ultimately, the best choice would depend on the context and the specific image you want to evoke.