Done, here's my email:
I'm writing to you because the Jehovah's Witnesses (Watchtower Society) are apparently participating in meetings organized by the OSCE. You might be interested to know how tolerant Jehovah's Witnesses actually are.
Firstly, Jehovah's Witnesses believe that their organization is the one true organization backed by God. They also believe that the whole world is controlled and/or influenced by Satan the Devil. This means that every other organization and government, including the OSCE, is, according to Watchtower belief, 'part of Satan's world'. One particular Witness doctrine I'd like to point out to you is Theocratic Warfare, also called Spiritual Warfare. Jehovah's Witnesses believe that they can lie to, and withhold information from, 'worldly' organizations and authorities.
With these doctrines in place, Jehovah's Witnesses can say one thing to fellow believers but something quite different to outsiders. Jehovah's Witnesses will tell you that they are tolerant but they practice the doctrine of shunning. Shunning means active Jehovah's Witnesses will cut off association with members that voice doubts over Watchtower doctrine or members that want to leave their organization. People join Jehovah's Witnesses by getting baptized. Baptism here means not only dedicating oneself to God but also dedicating oneself to the Watchtower organization. In Watchtower literature, there has been frequent encouragement for children to get baptized.
I was a member of Jehovah's Witnesses in the late 1990s and early 2000s. I have heard reports of children as young as 7 or 8 getting baptized. So it's possible, even likely, that a prepubescent child may get baptized (often under pressure from parents/elders), then realize the trap they've stumbled into. Alternatively they may find love outside the congregation. Jehovah's Witnesses are against adults consenting to sex outside of marriage (a basic human right) to the point of obsession. This predictably results in baptized children being shunned by their families when they do normal teenage things a few years down the road.
Obviously, Jehovah's Witnesses will not mention any of this to outsiders because it would doubtless make them look like what they are - a dangerous cult.
Please look into Jehovah's Witnesses/Watchtower very thoroughly before you decide to allow them to participate in your meetings.