History of Jehovah's Witnesses
Jehovah's Witnesses originated as a branch of the Bible Student movement, which developed in the United States in the 1870s among followers of Christian Restorationist minister Charles Taze Russell. Bible Student missionaries were sent to England in 1881 and the first overseas branch was opened in London in 1900. The group took on the name International Bible Students Association and by 1914 it was also active in Canada, Germany, Australia and other countries. The movement split into several rival organizations after Russell's death in 1916, with one—led by Russell's successor, Joseph "Judge" Rutherford—retaining control of both his magazine, "The Watch Tower", and his legal and publishing corporation, the Watch Tower Bible and Tract Society of Pennsylvania.
Alfred Vogel
Alfred Vogel was a member of Jehovah's Witnesses. The Dutch branch of the company (Biohorma) was (at the time) in the hands of Dutch Jehovah's Witnesses, especially the family of co-founder Bolle. Vogel propagated some doctrines of Jehovah's Witnesses in his book "Der kleine Doktor" ("The Nature Doctor"). In older editions, for example, one can read that God prohibited blood transfusion, and that applying this medical treatment could lead to a change in character.