Federal agents' visit was a hoax:

Dammit!! I hate wasting a rant, especially because of a stupid kid!

"The UMass Dartmouth student who claimed to have been visited by Homeland Security agents over his request for "The Little Red Book" by Mao Zedong has admitted to making up the entire story.
The 22-year-old student tearfully admitted he made the story up to his history professor, Dr. Brian Glyn Williams, and his parents, after being confronted with the inconsistencies in his account."