Marvel Premiere #29 (April 1976)
Appearances: Invaders v1 #6, 35-37, Marvel Premiere #29-30, Marvel Two-in-One Annual #1, Marvel Two-in-One #20.
Dates Active: 1942-1945.
In 1942 the Red Skull had kidnaped and brainwashed the Invaders, with only Bucky (I) evading capture. Bucky, realizing the danger that a German-friendly Invaders posed, sent out a call for help to all the other available superheroes. Several of them came forward to help Bucky: the Patriot, the Whizzer, Miss America, the Red Raven, the Thin Man, the Blue Diamond, and Jack Frost.
This group called themselves the "Liberty Legion" and successfully freed the Invaders from the Red Skull's grasp. After the Skull's defeat the Liberty Legion decided to remain together and act as the homefront equivalent of the Invaders.
They continued to fight various threats in the U.S. during the war, from crime to German sympathizers, and even encountered a time-traveling Thing at one point. After the Invaders and the Legion joined forces again, to fight the Iron Cross, the Whizzer and Miss America left the Legion to join the Invaders.
After WW2 ended the Legion and the Invaders disbanded, with some of the members of each group coming together to form the All-Winners Squad.
Useful Invaders Site
The Liberty Legion. Eric Colley's site.