Mudblood: A wizard or witch who is muggle-born. Muggle meaning non-magical people.
Snatchers: Members of an organization with the main purpose of rounding up Muggle-borns and "blood traitors."
Muggle-Born Registration Commission:An instrument of discrimination against Muggle-borns in line with Death Eater ideology. While Harry, Hermione, and Ron searched for the Horcruxes, life for all of the others in the Wizarding world was full of fear and worry. Those who were born to muggles or "blood traitors" struggled to keep out of the Death Eaters' terrible grips. Most of all, it was harder for the students attending Hogwarts to survive their wrath. Many bravely went to Hogwarts, facing the unknown future for their kind. Some stayed home with their parents, hoping to keep hidden, but were eventuallyfound. Finally, there was the few that began to hide after realizing their ill fate under Voldemort’s rule. For a while, running seemed to be the safer option, thought it only seemed to be safe until the Snatchers were introduced to the equation.
A rank below Voldemort’s posse, the Death Eaters, Snatchers were the main cause of why muggle-born wizards began to disappear. Out of all the names announced deceased on the radio, muggle-borns caught by the Snatchers were the majority. Snatchers ranged from werewolves to wizards, often with a vicious, menacing undertone to their personalities. They ruthlessly captured muggle-borns and sometimes took them to the Ministry of Magic, where they were interrogated and often killed by the Muggle-Born Registration Commission a.k.a. MBRC. Other times, they killed the muggle-borns on the spot.
Snatchers’ jobs varied from bringing adult mudbloods to the MBRC to returning runaway Students to Hogwarts. Often, they made up lies about their captive’s heritage so they could either kill them themselves or send them away. Either way,
Snatchers are to be avoided at all costs.