鉄道郵便局
In 1920, a secession from the NRLCA resulted in the forming of the National Federation of Rural Letter Carriers. The National Alliance of Postal Employees was formed in 1913 by black employees of the Railway Mail Service. Although the Union was organized to prevent the elimination of blacks from the railway mail service, in 1923, the NAPE became the first industrial union in the United States when it opened its membership to any postal employee who desired to join, regardless of race, sex, creed or religion. The NAPE allowed membership to all eligible postal employees of all crafts, rural carriers included.