On March 12, 1975, the Department of Labor issued an interpretive bulletin, ERISA IB 75-3, with regard to its interpretation of section 3(21)(B) of the Employee Retirement Income Security Act of 1974. That section provides that an investment by an employee benefit plan in securities issued by an investment company registered under the Investment Company Act of 1940 shall not by itself cause the investment company, its investment adviser or principal underwriter to be deemed to be a fiduciary or party