I attached a briefing from the Florida Department of Law Enforcement describing a threat from Anonymous to target federal and local law enforcement and Child Protective Services (CPS) with Telephony Denial of Service (TDoS) attacks. The attack is supposed to occur 3/21/2015. Anonymous is also calling for website defacements from now up to the TDoS attack date.
The bulletin includes links with contact information, instructions for the attacks, and background on alleged corruption. This includes a link to a Facebook page, which is a way to use social networking to organize the TDoS attack (encourage many people to call in).