Cemetery Wind was a secret black operations unit of the Central Intelligence Agency created by Harold Attinger (the main antagonist) in Transformers: Age of Extinction and they were the main antagonistic group in the movie.
They were tasked to eliminate any remaining Decepticons on Earth and were ordered by the President to leave the Autobots alone, but Attinger secretly disobeyed the President; he took advantage of his authority, made a deal with Lockdown, wiping out all Transformers, delivering their remains to KSI, then melting them down for materials to build their artificial, remote-controlled Transformers, make them a better world and killing anyone who discovered their operation. They killed Ratchet and Leadfoot, which were Autobots, not Decepticons, then proceeded to do the same with Optimus Prime. An off-screen battle explained by Lockdown was that Cemetery Wind and Lockdown were fighting him in Mexico City, having managed to shoot Optimus 3 times, yet Optimus was still able to escape and fled the battle to avoid getting killed, causing Lockdown to start blaming and re-consider his contract with Cemetery Wind.
Deciding to function like a state police, they started offering financial rewards to ordinary citizens that report alien activity towards them. Cade Yeager's greedy, backstabbing friend Lucas Flannery turned Optimus in, but rather than getting the check, Lucas got guns pointed at his face when Cemetery Wind couldn't find Optimus and suspected Cade, Tessa and Lucas were all hiding the Autobot leader. Optimus refused to sacrifice Cade and Tessa's lives to furthermore ensure his own safety, so he jumped out to assault and kill many Cemetery Wind members, although he didn't have enough time to wipe them all out when Lockdown started chasing him. A chase ensues in the city with Cemetery Wind pursuing Cade, Tessa, Shane and Lucas. The humans successfully escape by driving off a ramp and except for Lucas who gets killed by Lockdown's grenade, manage to reconnect with Optimus and escape. Attinger then scolds and demerits his men for their failure to catch Optimus, not considering at all that the Autobot was too biologically advanced for human capture.
After the war in Hong Kong ended, with both of Attinger and Savoy's deaths, Cemetery Wind is disbanded by the President, as well as the U.S. government and labeled it as a Decepticon Organization. It was presumed that the other Cemetery Wind members might have been killed or arrested for their actions, as they are now No. 1 on the NSA, CIA, Interpol and FBI's most wanted list.