20 C.F.R. § 404.1035 Work for a communist organization.
Title 20 - Employees' Benefits
If you work as an employee of an organization which is registered, or which is required by a final order of the Subversive Activities Control Board to register under the Internal Security Act of 1950 as a communist action, communist-front, or communist-infiltrated organization, your work is excluded from employment. The exclusion is effective with the calendar year in which the organization is registered or the final order is in effect.
Title 20: Employees' Benefits
PART 404—FEDERAL OLD-AGE, SURVIVORS AND DISABILITY INSURANCE (1950– )
Subpart K—Employment, Wages, Self-Employment, and Self-Employment Income
Work Excluded From Employment
§ 404.1035 Work for a communist organization.