Did Barty Crouch Jr. attend Hogwarts? In which house was he sorted?
What's the breakdown of Hogwart's Professor in Houses? lists him as a Slytherin, but gives no evidence. Do you have any evidence?
During the events of Harry Potter and the Goblet of Fire, Barty shows signs of all house traits. He is brave enough to execute a cunning plan to snatch Harry from just under Professor Dumbledore's nose, risking that he could be discovered as an impostor any time. He is power-hungry, as in his forced confession, he believes his act would make him the most trusted servant of the Dark Lord, closer to him than any Death Eater. He is hard-working, studying all the details of the habits of Mad-Eye Moody and keeping up the act all year, while also making sure he secretly follows Harry's preparations for the tasks. He is clever, being able to design such a plan, and especially being able to magically convince the Goblet to choose Harry.
I'm asking this question partly because of Was Wormtail the only Dark wizard sorted to Gryffindor?