There is a good bit of speculation about whether or not this story is true. From BoingBoing:
A Massachussetts paper is reporting that a college student was visited by Department of Homeland Security agents in October after requesting a copy of Quotations From Chairman Mao Tse-Tung — better known as “The Little Red Book” — from a university library:
Two history professors at UMass Dartmouth, Brian Glyn Williams and Robert Pontbriand, said the student told them he requested the book through the UMass Dartmouth library’s interlibrary loan program. . .
The professors said the student was told by the agents that the book is on a “watch list,” and that his background, which included significant time abroad, triggered them to investigate the student further.