Code of Federal Regulations Title 5. Administrative Personnel § 5.251.102 Coverage

(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;

(b) Must not discriminate in terms of membership or treatment because of race, color, religion, sex, national origin, age, or handicapping condition;

(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

(d) Must not advocate the overthrow of the constitutional form of Government of the United States.