The Teamsters began to expand dramatically and mature organizationally under Tobin. When he was elected president, power in the union was held by big-city locals—which handled all research, contract negotiations, legal services, communication and strike activity. Tobin pushed for the development of "joint councils" to which all local unions were forced to affiliate. Varying in geographical and industrial jurisdiction, the joint councils became important incubators for up-and-coming leadership and negotiating master agreements which covered all employers in a given industry. As collective bargaining became the norm throughout the Teamsters, Tobin actively discouraged strikes in order to bring discipline to the union and encourage employers to sign contracts. Tobin also founded and edited (for a time) the union magazine, the "International Teamster."