Secret Avengers (Civil War)

During Civil War, Captain America's group of unregistered vigilantes were called the "Secret Avengers" by the press. They did not retain that label after the War was over and Captain America was killed. This group was unrelated to the covert ops team of Avengers that followed after Siege.

Other members unrelated to the X-Men include Captain America, Hercules, Daredevil II, Goliath V, Falcon, Luke Cage, Black Panther, Nighthawk, Punisher, Tigra, Monica Rambeau, Human Torch, Invisible Woman, Asp, Black Mamba, Diamondback, Living Lightning, Ultra Girl, Firebird, and the Young Avengers.