Maryland Code, State Personnel and Pensions § 2-403

(a)(1) Subject to subsection (b) of this section, on the written request of an employee to pay dues to an organization by payroll deduction, the Central Payroll Bureau shall:

(2) An employee may cancel a payroll deduction of organization dues by written notification to the Central Payroll Bureau.

(1) an organization that has a membership of 1,000 or more State employees;

(2) an organization for which the potential field of membership is limited to fewer than 1,000 State employees, if the Governor has approved the deduction for that organization; or

(3) an organization for which payment of dues by payroll deduction was authorized on or before June 29, 1983.