Section 2
SEC. 2. Section nine of the same Act, as amended is further amended to read as follows: "SEC. 9. Compulsory coverage.&mdashCoverage in the System shall be compulsory upon all employees not over sixty years of age and their employers: Provided, That any benefit already earned by employees under private benefit plans existing at the time of the approval of this Act shall not be discontinued, reduced or otherwise impaired: Provided, further, That private plans which are existing and in force at the time of compulsory coverage shall be integrated with the plan of the System in such a way where the employer's contribution to his private plan is more than that required of him in this Act he shall pay to the System only the contribution required of him and he shall continue his contributions to such private plan less his contribution to the System so that the employer's total contribution to his private benefit plan and to the Social Security System shall be the same as his contribution to his private plan before the compulsory coverage: Provided, further, That any changes, adjustments, modifications, eliminations or improvements in the benefits to be available under the remaining private plan, which may be necessary to adopt by reason of the reduced contribution thereto as a result of the integration, shall be subject to agreements between the employers and employees concerned: Provided, further, That the private benefit plan which the employer shall continue for his employees shall remain under the employer's management and control unless there is an existing agreement to the contrary: Provided, finally, That nothing in this Act shall be construed as a limitation on the right of employers and employees to agree on and adopt benefits which are over and above those provided under this Act."