Private Sector Employment. There are no earnings limitations for superannuation retirees who work in the private sector.Public employees who are members of a Massachusetts public retirement system can qualify for a retirement benefit once they meet certain requirements. Membership in a contributory retirement system is mandatory for nearly all public employees who are regularly employed on a full-time basis. (1) Right to a Superannuation Retirement Allowance. Although each system operates independently, they are all bound together under one uniform retirement law, Chapter 32 of the Massachusetts General Laws. The Social Security number (SSN) was created in 1936 for the sole purpose of tracking the earnings histories of US workers. TITLE IV--DISTRICT OF COLUMBIA. The City of Framingham offers employees seven health insurance plans through the GIC (Group Insurance Commission). You must complete, sign and date the bottom of the form.