The Ministry of Genetic Purity, also known as the Genetic Purity Ministry, was an agency of the Terran Empire of the Mirror universe and was headed by a Minister. Its duty involved the protection and defense of the empire against invasive parasites, alien shapeshifters and genetically engineered criminals. Similar to the Ministry of Vassal Affairs, it lacked the power to enslave Terran citizens or the inhabitants of a subject world. (Decipher RPG module: Through a Glass, Darkly)