Short answers, pulled from the story.
Charles Taze Russell formed a Bible study group in Pittsburgh, Pennsylvania in 1870. This small gathering eventually grew into a global movement known as Jehovah's Witnesses.
Joseph Franklin Rutherford introduced the name Jehovah's witnesses at a convention in Columbus, Ohio on the 26th of July 1931. This decision distinguished his group from other independent Bible Student organizations.
Jehovah's Witnesses reported approximately eight million publishers across about two hundred thousand congregations in 2023. Only those who submit reports for personal ministry are counted in official statistics.
Approximately twenty thousand Jehovah's Witnesses existed in Nazi Germany during 1933 with about ten thousand imprisoned. Two thousand were sent to concentration camps where they wore purple triangles and as many as twelve hundred died including two hundred fifty executed individuals.
Norway lost state funding as religious community due to shunning policy concluding it constituted psychological violence particularly against children. Changes made in 2024 allow simple greetings to shunned members if not deemed apostates.