Official Magical Secrets Act

The Official Magical Secrets Act was a law made by the Ministry of Magic that prohibited certain people from sharing classified information.

Newton Scamander wrote in the foreword of Fantastic Beasts and Where to Find Them in 2017 that he was unable to share more information on the true nature of his relationship with Albus Dumbledore, other than a hint there was more to them than meets the eye, as he was worried he would break the act.