5 CFR §251.102

1. (a)Must be a lawful, nonprofit organization whose constitution and bylaws indicate that it subscribes to minimum standards of fiscal responsibility and employs democratic principles in the nomination and election of officers;
2. (b)Must not discriminate in terms of membership or treatment because of race, color, religion, sex, national origin, age, or handicapping condition;
3. (c)Must not assist or participate in a strike, work stoppage, or slowdown against the Government of the United States or any agency thereof or impose a duty or obligation to conduct, assist, or participate in such strike, work stoppage, or slowdown; and
4. (d)Must not advocate the overthrow of the constitutional form of Government of the United States.