The liberal Center for American Progress (CAP)

"CAP, according to a report in The Nation, has received funding from war contractors Lockheed Martin and Boeing, who make the bombers that CAP wants to rain hellfire on Syria. The Brookings Institute has taken tens of millions from foreign governments, notably Qatar, a key player in the military campaign to oust Assad. Retired four-star Marine general John Allen is now a Brookings senior fellow. Charles Lister is a senior fellow at the Middle East Institute, which has received funding from Saudi Arabia, the major financial force providing billions in arms to upend Assad and install a Sunni caliphate stretching across Iraq and Syria."