The Amazing Amazon were the first and foremost female members of their parallel planets' protectors. On Earth-One, Wonder Woman was a founding member and continued working with the team until she lost her powers for a time, at which point she became an honary member of the Justice League of America.
On Earth-Two, Wonder Woman joined the Justice Society months after it was formed, and only then as its recording secretary. It would take years before her allies allowed her to participate in their cases actively, despite being among the Society's most powerful members! Still, both Amazons proved true assets for their teams up until, and even after, those groups had been dissolved.