There was an infiltration of the Ministry of Magic on 2 September, 1997, during the height of the Second Wizarding War. The Ministry had recently fallen to Lord Voldemort and his Death Eaters. Harry Potter, Hermione Granger, and Ron Weasley snuck inside the Ministry in order to steal one of Voldemort's Horcruxes, Salazar Slytherin's Locket. In the process, the Trio also freed multiple Muggle-borns who were awaiting trial, as well as reclaiming Alastor Moody's magical eye from Dolores Umbridge that was placed on a peephole in her office door so she could spy on her colleagues.