Compulsory membership provisions and dues checkoff are forms of union security.

Union Security

Agreements or practices that ensure the financial and membership stability of labor unions, typically involving arrangements like union shops or agency shops in workplace policies.

Compulsory Membership

A requirement for individuals to join a particular organization or group, often seen in unions or professional associations.

Dues Checkoff

A process where an employer automatically deducts union dues from the workers' paychecks and transfers them to the union.