Eastern Cherokee, Southern Iroquois, and United Tribes of South Carolina

The Eastern Cherokee, Southern Iroquois and United Tribes of South Carolina, Inc. or ECSIUT is a 501(c)(3) nonprofit organization and "state-recognized group" not to be confused with a state-recognized tribe. The state of South Carolina gave them the state-recognized group and special interest organization designation under the SC Code Section 1-31-40 (A) (7)(10), Statutory Authority Chapter 139 (100-111) on February 17, 2005.

The Eastern Band of Cherokee Indians, Cherokee Nation, and United Keetoowah Band of Cherokee Indians are collectively opposed to the ECSIUT, with the Cherokee Nation notably including the organization in a list of 212 "fraudulent groups" that claim Cherokee identity. These three federally recognized tribes uniformly uphold a strict stance against federally unrecognized Cherokee heritage groups asserting Cherokee tribal identity.

Headquarters and purpose
The ECSIUT was first headquartered in Columbia, South Carolina and led by William Moreau Goins, who founded the group and served as CEO until his passing in late 2017. In April of 2020, the ECSIUT elected archaeologist Lamar Nelson as their new chief and CEO. Nelson previously served on the organization's board and alleges to be of Choctaw and Cherokee descent. The ECSIUT is presently headquartered in Duncan, South Carolina.

The ECSIUT was established with the mission to "preserve, present, protect, and document Cherokee history and other Native American Indian tribes' cultures and individuals, material culture, historic buildings, and folkways in South Carolina".

Membership
The ECSIUT as a state-recognized "group" under South Carolina law, is composed of individuals with diverse characteristics, interests, and behaviors that do not reflect a unified ethnic and cultural heritage. The organization includes Native Americans and people from other ethnic groups, without need for blood relation amongst members. This membership designation differs from that of a state-recognized tribe, where members are part of an assembly of various interrelated families, clans, or generations, and their descendants.

Activities
For 20 years the ESCIUT hosted an annual Native American film festival in Columbia, South Carolina which gave exposure to Indigenous filmmakers.

The ESCIUT hosts an annual powwow at Hagood Mill Historic Site in Pickens County, South Carolina.