Ward Churchill, To Disrupt, Discredit and Destroy: The FBI's Secret War Against the Black Panthers:
The coloring book has a rather interesting history. Rendered in the manner of Panther Minister of Culture Emory Douglas, illustrator for The Black Panther and an artist displaying a highly characteristic style, it was created in late 1968 by James Teemer, an aspiring recruit in the Panthers’ Sacramento chapter eager to impress the BPP leadership with his graphic talents. Upon review of a 25 copy pilot edition, the Party’s Central Committee determined that the book’s content was inappropriate for young people. Bobby Seale thereupon instructed that the book not be produced, and that the original proof copies be destroyed.
Nonetheless, a print run of 1,000 copies was quietly ordered and paid for by Larry Clayton Powell, a member of the Los Angeles chapter who’d been promoted to work among the Party’s Oakland-based national cadre. There is no evidence as to how many of these unauthorized publications were distributed to children before the remainder found their way into the hands of the San Francisco police and, thence, the FBI. The mystery of how all this might have happened was dispelled in June 1969 when Larry Powell and his wife, Jean, also a former LA Panther cum national cadre member, appeared before Senator John McClellan’s Permanent Subcommittee on Investigations to testify that the Panthers were an "organized criminal enterprise" along the lines of the Mafia. Both of them, along with another national office staffer, Tommy Jones, were thereupon revealed to have infiltrated the Party in 1967, first as informers for local police, later for the FBI as well (at which point Larry Powell, at least, had begun to function as an outright agent provocateur).
UPI, Jun. 1969:

For reference, here is a 1976 Congressional staff report on the matter of the FBI's repressive activities against the Black Panthers:
The FBI'S Covert Action Program to Destroy the Black Panther Party
What Glenn Beck did here is not surprising in the least. He would have got along very well with J. Edgar Hoover I imagine.
...as it turns out, at least one blogger predicted this would happen:
If Glenn Beck gets his pudgy white hands on this, he’ll go apeshit.
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