For the purposes of this article “club” also means any letter carriers local which is chartered by a national labor organization having affiliates in each state of the United States, which consists of not less than 1,500 members as defined by the National Labor Relations Act, and which owns or leases a building of not less than 5,000 square feet that is used by the members, or by the members of other labor organizations, or both, for their social activities. No letter carriers local which makes any discrimination, distinction, or restriction against any person on account of such person’s age, sex, color, race, religion, ancestry, or national origin shall be licensed

pursuant to this section. No club licensed under this section shall engage in the sale of alcoholic beverages for consumption outside of the licensed premises.