11 Times Fantastic Beasts References the Harry Potter Series

Grindelwald is mentioned quite a bit in Harry Potter. Here are the basics: he's one of the most infamous and dangerous dark wizards in history. He becomes obsessed with the Deathly Hallows and eventually steals the Elder Wand once he discovers it. He develops a deep, personal friendship with Albus Dumbledore. And above all, Grindelwald is in adamant opposition of the International Statute of Secrecy, which was the law that put the Wizarding World in hiding in the first place.