Allies are nondisabled people who support the efforts of self-advocates.
In this context, an ally is a nondisabled person who chooses to work with disabled self-advocates and activists. A good ally will keep the focus on what the disabled advocates want, rather than what abled people want for disabled people.
-List of related media/links
-List of concrete examples
Case example: A non-autistic person who helps their autistic friend fight discrimination.