Labor organization means a labor organization engaged in an industry
affecting commerce and includes any organization of any kind, any
agency, or employee representation committee, group, association, or
plan so engaged in which employees participate and which exists for the
purpose, in whole or in part, of dealing with employers concerning
grievances, labor disputes, wages, rates of pay, hours, or other terms
or conditions of employment, and any conference, general committee,
joint or system board, or joint council so engaged which is subordinate
to a national or international labor organization, other than a State or
local central body.