Okla. Stat. tit. 25, § 25-1304: Discriminatory practices - Labor organizations

It is a discriminatory practice for a labor organization:

1. To exclude or to expel from membership, or otherwise to

discriminate against, a member or applicant for membership because

of race, color, religion, sex, national origin, age, genetic

information or disability, unless the organization can demonstrate

that accommodation for the disability would impose an undue hardship

on the operation of the business of such organization;

2. To limit, segregate, or classify membership, or to classify

or to fail or refuse to refer for employment an individual in a way:

a. which would deprive or tend to deprive an individual

of employment opportunities, or

b. which would limit employment opportunities or

otherwise adversely affect the status of an employee

or of an applicant for employment, because of race,

color, religion, sex, national origin, age, genetic

information or disability, unless the organization can

demonstrate that accommodation for the disability

would impose an undue hardship on the operation of the

business of such organization; or

3. To cause or attempt to cause an employer to violate Section

1101 et seq. of this title.