Should Jehovah’s Witnesses be called an ‘extremist organization?

Here in Nigeria and other parts of the world, they are known for their door-to-door preaching, and distributing The Watchtower and Awake!

Does any of these mean they are an extremist group?

Have you say in a Poll at this link

http://pulse.ng/religion/religious-talk-should-jehovah-s-witnesses-be-called-an-extremist-organization-id6398372.html