He says black people and American Indians have a pivotal past.
Speaking at a forum hosted by members of the Congressional Black Caucus, Glover said other tribes will take similar action if the Cherokee Nation succeeds in blocking freedmen descendants' tribal citizenship.
The issue is in court after a March 2007 vote by the Cherokee Nation to remove freedmen descendants from tribal rolls.
Glover described the relationship linking American Indians and black people as one of the most pivotal in the nation's evolution.
"I've always embraced that relationship," he said. "My own grandmother was part Choctaw."
He cited the history of black people who escaped their captors and found refuge among the Indian tribes, as well as the strategic help black people offered the Seminoles in their war against the tyranny of the colonies.
Both groups, Glover said, have seen genocide and exploitation.
"But I am disturbed by what I see," he said, calling on black people to serve as the moral compass on such issues as the freedmen descendants' quest to have full citizenship rights in the Cherokee Nation. "These are very important decisions that we have to make. They are moral decisions."