|"Are you a wizard or not?"
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An army of wizards and witches followed the Dark Wizard Gellert Grindelwald in the early twentieth century. They sought to create a worldwide wizarding empire, which would overturn the International Statute of Wizarding Secrecy and force the Muggle population into slavery under their motto: "For the Greater Good"
Between about 1900 when Grindelwald fled Britain and 1945, the year of his downfall, Dark Wizard Gellert Grindelwald formed an army, presumably consisting of witches and wizards and possibly other magical creatures, with the purpose of building a worldwide Wizarding empire that ruled Muggle society as well as magical. Grindelwald intended to unite the Deathly Hallows, which he believed would make him and his followers invincible.
After a number of years terrorising Europe, Grindelwald was defeated by Albus Dumbledore. While the army's status at this time is unknown, it can be assumed that the remaining members were hunted down and arrested by wizarding authorities, killed for resisting, or possibly had dissolved into hiding.