Snatchers are bounty hunters who are in it solely for the money and other pickings. They have a list of Voldemort's most wanted, and check the names of anyone they accost against it. When Harry, Ron and Hermione are surrounded by snatchers, Hermione jinxes Harry's face so he is unrecognisable, and when questioned says she is Penelope Clearwater, a half-blood, whereas Hermione herself is a muggle (and so under Voldemort's regime, is not entitled to carry a wand). Ron says his name is Stan Shunpike. Are the snatchers fooled? The existence of Snatcher in the cast indicates that this part of the story may make it into the script.