spook by the door
n.β Β«He claims Benjamin and Williams label white people who speak out against them as racists and any other black person who opposes them as a βspook by the door,β a pejorative term referring to a black person who spies on the black community for white people.Β» ββA Tangled Web” by Nathan Stubbs Independent (Lafayette, La.) Jan. 18, 2006. (source: Double-Tongued Dictionary)