Union Security Clause Law and Legal Definition

A union security clause is a provision in a union contract requiring employees, as a condition of employment, to maintain union membership or pay union dues or requiring an employer to check off dues from employees' wages.

Typically, it provides that all employees must become and remain union members in good standing during the duration of the agreement. Good standing is usually defined as payment of periodic dues and initiation fees. The provision also states that an employee who fails to pay union dues or initiation fees must be discharged by the employer at the union's request.