Alabama Constitution of 1901, Art. I, § 36.05

(a) It is hereby declared to be the public policy of Alabama that the right of persons to work may not be denied or abridged on account of membership or nonmembership in a labor union or labor organization.

(b) An agreement or combination between an employer and labor union or labor organization which provides that a person who is not a member of the union or organization shall be denied the right to work for the employer, or where membership in the union or organization is made a condition of employment or continuation of employment by the employer, or where the union or organization acquires an employment monopoly in any enterprise, is hereby declared to be against public policy and an illegal combination or conspiracy.

(c) No person shall be required by an employer to become or remain a member of any labor union or labor organization as a condition of employment or continuation of employment.

(d) A person may not be required by an employer to abstain or refrain from membership in any labor union or labor organization as a condition of employment or continuation of his or her employment.

(e) An employer may not require a person, as a condition of employment or continuation of employment, to pay dues, fees, or other charges of any kind to any labor union or labor organization.

(f) This amendment shall not apply to any lawful contract in force on or prior to the date of the ratification of this amendment but it shall apply in all respects to contracts entered into after the date of the ratification of this amendment, and to any renewal or extension of an existing contract.