Section 6. Except in any city or town as to which it is otherwise provided by special law, the registrars on or before April fifteenth in each year, shall prepare lists containing the names and addresses of all persons seventeen years of age or older listed by them under section four for the current year. Such lists shall be arranged in cities by streets, and in towns by streets or alphabetically by the names of the persons listed, and in cities and in towns of over five thousand inhabitants according to the latest national census, by the smallest subdivision of the city or town for the purpose of voting. On or before June fifteenth in each year, the registrars in all cities and towns shall cause a sufficient number of such lists to be printed, typed or mimeographed so as to furnish, free of charge, such lists, upon request, to all duly organized political committees and to all political candidates of the various districts in which the city or town is located. Such lists shall be made available by the registrars to business organizations and other nonpolitical committees and organizations at a fee to be determined by said registrars, and any such person or authorized representative of an organization or committee obtaining such list shall sign a log, maintained by the city or town clerk, placing in such log their names and addresses.