Section 29. All companies now or hereafter incorporated or formed by authority of any general or special law of the commonwealth shall, except as provided in section one hundred and fourteen and in chapter one hundred and seventy-six, be subject to this chapter. Trade unions and other associations of wage workers whose principal objects are to deal with the relations between employers and employees relative to wages, hours of labor and other conditions of employment, and trusts complying with the requirements of subsections (a) and (b) of section 186c–5 of Title 29, U.S.Code and athletic and other school organizations formed for administering a plan for the payment of benefits to school pupils injured while participating in school athletics, commonly known as the school athletic accident-benefit plan, shall not be subject to this chapter, except as hereinafter provided, or to chapter one hundred and seventy-six. The president and the treasurer of such an athletic or other school organization shall, within thirty days after a written request therefor by the commissioner, file with him a financial statement, in such form and detail and of such date as he may prescribe, signed and sworn to by them.