I just finished watching Harry Potter and the Sorcerer's (Philosopher's) Stone on DVD. Not my first time seeing in the movie by a long shot, but Quirrell captured my attention during the film. He was a servant of Lord Voldemort I have heard on Pottermore that Quinius Quirrell was a Ravenclaw, and that Hufflepuff has had the fewest Dark wizards, so I started thinking of some famous Dark Witches and Wizards each of the four Houses may have.
Slytherin had Lord Voldemort (most famously, along with many Death Eaters) Gryffindor had Wormtail; Ravenclaw had Quirrell.
I have tried to find some Dark Witch or wizard from the Hufflepuff house, but only in vain.
Are there any current Dark Wizards (most likely in Azkaban) or former Dark Wizards who are known to have been a part of the Hufflepuff House?