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.
Bible Student movement
Between 1918 and 1929, several factions formed their own independent fellowships, including the Stand Fast Movement, the Pastoral Bible Institute, the Laymen's Home Missionary Movement founded by PSL Johnson, and the Dawn Bible Students Association. These groups range from conservative, claiming to be Russell's true followers, to more liberal, claiming that Russell's role is not as important as once believed. Rutherford's faction of the movement retained control of the Watch Tower Society and adopted the name "Jehovah's Witnesses" in July 1931. By the end of the 20th century, Jehovah's Witnesses claimed a membership of 6 million, while other independent Bible Student groups were estimated to total less than 75,000.