Wilderness Land Trust

The Wilderness Land Trust is a 501(c)(3) non-profit organization based in Bainbridge Island, Washington, whose mission is to acquire private lands (inholdings) in current and proposed wilderness areas and transfer them to the federal government so that they will be kept forever wild as wilderness. Since the Trust was founded in 1992 it has purchased nearly in 108 wilderness areas.
Private land inside wilderness areas.
About of inholdings remain within the National Wilderness Preservation System, mostly the legacy of 19th-century land disposal practices such as the General Mining Act of 1872, the Homestead Act, and Railroad Land Grants. Under the Wilderness Act of 1964, private land inside wilderness areas may be mined, logged, and otherwise developed. In some cases roads and utilities may be extended through surrounding wilderness, and houses may be constructed. By acquiring inholdings as they become available, the Trust keeps these areas free from development.
Reasoning.
According to the Wilderness Land Trust, the development of wilderness inholdings has the following adverse impacts: