The Tennessee ACLU sent a letter to public schools warning them not to celebrate Christmas as a religious holiday. The Tennessee Fusion Center (H/T Uncle) put the communication on its map of “terrorism events and other suspicious activity”:

“ACLU cautions Tennessee schools about observing ‘one religious holiday,’” the website’s explanation reads.

Also among the map’s highlights: “McMinn County Teen Brings Gun to School,” and “Turkish National Salih Acarbulut Indicted in Chattanooga for Alleged $12 million Ponzi Scheme.”

Mike Browning, a spokesman for the Fusion Center, said “that was a mistake” to label the ACLU letter as a suspicious activity. He said the Fusion Center meant to use the icon that means merely general information. The icon was changed after the ACLU sent its news release, he said.

“It’s still on the map,” Browning told The City Paper. “It has been reclassified into the general information category.”

But a look at the website shows there is no icon for general information. Instead, the icon for the ACLU letter now signifies “general terrorism news,” according to the website’s legend.

This follows a long line of fusion center and DHS reports labeling broad swaths of the public as a threat to national security. The North Texas Fusion System labeled Muslim lobbyists as a potential threat; a DHS analyst in Wisconsin thought both pro- and anti-abortion activists were worrisome; a Pennsylvania homeland security contractor watched environmental activists, Tea Party groups, and a Second Amendment rally; the Maryland State Police put anti-death penalty and anti-war activists in a federal terrorism database; a fusion center in Missouri thought that all third-party voters and Ron Paul supporters were a threat; and the Department of Homeland Security described half of the American political spectrum as “right wing extremists.”

The ACLU fusion center report and update lay out some good background on these issues, and the Spyfiles report describes how monitoring lawful dissent has become routine for police departments around the nation. Cato hosted Mike German, a former FBI counterterrorism agent and co-author of the ACLU fusion report at a forum on fusion centers, available here.