In the seventeenth century, the promulgation of the International Statute of Secrecy isolated wizards from Muggles, and the two worlds maintained a peaceful situation for more than two hundred years. It was not until World War II that Muggles became aware of Grindelwald's presence behind the war, which aroused their vigilance. Witch hunter organizations were established in various countries to deal with attacks from extremist wizarding organizations. During the short period of peace that followed, the top leaders of the two worlds went through a long period of testing, exchanges and negotiations, and finally reached a consensus: Muggle governments ordered the dissolution of witch hunter organizations, and the International Federation of Wizards urged the ministries of magic of various countries to strengthen the implementation of the "Secrecy Act".
But extremist ideas will not disappear. The Holy Wizards Association in the United States and the Death Eaters in the United Kingdom are ironclad evidence of their resurgence. Correspondingly, although the Muggles disbanded the witch hunter organization in accordance with the agreement, they only asked the witch hunters to move their offices to the buildings of the intelligence agencies of various countries.
Voldemort and the Death Eaters made Muggles' hatred of wizards reach its peak, so much so that it took more than ten years after the Battle of Hogwarts for the two worlds to resume diplomatic relations.
And this opportunity to break the ice is the "Voldemort Resurrection Case"...
The French Auror located where the case occurred had no clue about this, so he applied to the International Auror Organization for assistance in handling the case. Since Voldemort was from the United Kingdom, this invitation letter was sent to Harry Potter, who was the director of the Auror Office at the time.
Taking this opportunity, he met Jenny Philby, who was also asked to help, which caused ripples in his heart after being single for many years...
Mission: Truth, Justice and Rebirth