|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Scumsucker is a derogatory term used to describe "Muggle-lovers" (wizards and witches who do not hold prejudices against, and who freely associate with, Muggles and Muggle-borns). This would include those such as Arthur Weasley or Albus Dumbledore, two important members of the Order of the Phoenix.