Steven I. Weiss has written a piece for the Forward on the Slifkin book-banning. Strangely, he fails to mention the blogs – Chakira, House of Hock, and Hirhurim prominent among them – who broke this story and have done much of the reporting that SIW (the founder of the now-shuttered Protocols blog) heavily relies on for his report.
To understand the development of this ban, see here and here.