Except for the President and Vice President, all federal civilian executive branch employees are covered by the Hatch Act, including employees of the U.S. Postal Service. Even part-time employees are covered by the Act, and all employees continue to be covered while on annual leave, sick leave, leave without pay, or furlough. However, employees who work on an occasional or irregular basis, or who are special government employees, as defined in title 18 U.S.C. § 202(a), are subject to the restrictions only when they are engaged in government business. Federal employees fall within two categories under the Hatch Act, Further Restricted and Less Restricted.