Applies to establishments engaged as labor unions or employee representative associations. This classification applies to the employees of the union or association itself as opposed to the members that they represent, who are employees of other businesses. These establishments act as bargaining agents for others; they maintain membership records, collect dues, and negotiate contracts. This classification includes labor union officials, business agents, organizers and other employees with combined inside and outside duties.

This classification excludes clerical office employees who may be reported separately in 4904 if the conditions of the standard exception general reporting rule are met.