I personally don't consider the Watchtower Organization to be a violent group with terrorist motives ... however ....
The control of this organization is quite astonishing and they do have a network to be envied by any terrorist group.
Cedars' impending judical committee brought the reality of this to my mind.
While the Organization may be peaceful as far as worldly involvement goes, consider what they are able to accomplish globally. If you are a part of the religion and you choose to mess with them, they will find you, they will have their representatives deal with you, they control how even your closest family members will treat you if their allegiance to the Organization is strong.
Governments of the world have borders, and while they may have covert ways of dealing in other lands, all loyal JW's, all over the world, are controlled by 8 men in New York. What is said from New York is as good as coming from God to loyal JW's and is not filtered by any worldly authorities, no diplomatic channels.
Certainly, JW's are mostly good and peaceful people, but what a potentially global sleeper cell it could be in the hands of desperate men.