The Commonwealth and all public officers, municipal corporations, political subdivisions, and public bodies, all banks, bankers, trust companies, savings banks and institutions, building and loan associations, savings and loan associations, investment companies and other persons carrying on a banking business, all insurance companies, except domestic life insurance companies, and all fiduciaries may legally invest any sinking funds, moneys or other funds belonging to them or within their control in any bonds or other obligations issued by any such authority, and such bonds and other obligations shall be authorized security for all public deposits and shall be fully negotiable in this Commonwealth; it being the purpose of this chapter to authorize any persons, firms, corporations, associations, political subdivisions, bodies and officers, public or private, to use any funds owned or controlled by them, including (but not limited to) sinking, insurance, investment, retirement, compensation, pension funds, and funds held on deposit, for the purchase of any such bonds or other obligations and that any such bonds or other obligations shall be authorized security for all public deposits and shall be fully negotiable in this Commonwealth.