All telephone calls to and from the THEIC in connection with all phases of the telephone hiring system operation shall be recorded and all said recordings made by the New York Shipping Association, Inc., the International Longshoremen's Association or by a joint board of the New York Shipping Association, Inc. and the International Longshoremen's Association, shall be retained for a period of six months under the sole custody and control of the commission. The commission may review and abstract said recordings in any manner. The commission may also monitor, in any manner, any and all incoming or outgoing telephone calls concerning the telephone hiring system operation.