he phraseof a purely local character applies to benevolent life insurance associations, and not to the other organizations specified in section 501(c)(12). It also applies to any organization seeking exemption on the ground that it is an organization similar to a benevolent life insurance association. An organization of a purely local character is one whose business activities are confined to a particular community, place, or district, irrespective, however, of political subdivisions. If the activities of an organization are limited only by the borders of a State it cannot be considered to be purely local in character