CHICAGO – Three protesters pleaded not guilty to terrorism-related charges Monday that accuse them of plotting to attack President Barack Obama's campaign headquarters with Molotov cocktails during the NATO summit in Chicago earlier this year.

Around 20 supporters drew the ire of the presiding judge by cheering and raising clenched fists during the arraignment. The gestures of solidarity seemed to buoy the spirits of the suspects, who have been jailed since their arrests days before summit began in May.

The charges against the men include four filed under Illinois' never-before-used anti-terrorism statutes. Prosecutors also revealed for the first time that their evidence includes secretly recorded conversations, though they offered no details.