“The Ministry has fallen. Scrimgeour is dead. They are coming.”
-- Kingsley's Patronus, appearing in the midst of the wedding celebrations (DH8)
The Minister of Magic, Rufus Scrimgeour, is tortured and murdered. Pius Thicknesse, who was put under the Imperius Curse a week or two before, is installed as the new Minister. With the power of the Ministry behind them, Death Eaters openly attack Order of the Phoenix safe houses.