No employer within the corporate boundaries of the city shall:

A. Require any person to be recommended or approved by, or to be cleared through, any labor organization as a condition of employment or continuation of employment; or

B. Deduct from the wages, earnings or compensation of an employee any union dues, fees, assessments or other charges to be held for or paid to a labor organization, unless the employer has first received a written authorization for the deduction signed by the employee, which authorization may be revoked by the employee at any time by giving written notice of such revocation to the employer. (Ord. 1345-89 § 4, 1989).