Burke and Hare

Burke and Hare were a pair of murderers who killed their victims in order to provide bodies for anatomical study.

While aboard the SS Marie Antoinette in 1890s London, Clara Oswald referred to the ship's crew of Clockwork Droids as "Burke and Hare from space", because those clockwork robots had likewise been committing murders in order to harvest organs from the victims. (TV: Deep Breath)