An urgent bulletin is going out to law enforcement Wednesday, warning of a new threat of attacks against officers on the street and in prisons.

It has to do with what's called Black August.

I-Team Reporter Dan Noyes has a source in law enforcement that leaked the bulletin to him. He wants you to understand the potential dangers officers are facing. In his words, when it hits the fan, you'll know the reason why.

The Federal Bureau of Prisons, Sacramento Intelligence Unit and the FBI's National Gang Intelligence Center have issued a bulletin to law enforcement, warning of increased risk for violence during Black August.

The prison gang Black Guerilla Family or BGF started Black August in the 1970's as a month to honor fallen members.

One of the biggest, Hugo Pinell served 46 years in solitary confinement after a San Francisco rape conviction, after killing a prison guard, and slashing the throats of two other guards who survived during an escape attempt in 1971.

Former San Quentin inmate Jerry Elster remembers Pinell as a freedom fighter. "When I went to prison at 20 years old, there was somebody there to remind me not to compromise my integrity," Elster said.

Last summer, just 12 days after corrections finally released Pinell from solitary, he was stabbed to death in a riot at state prison Sacramento.

The bulletin says the Black Guerilla Family believes state prisons worked with the Aryan Brotherhood to Kill Pinell.

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