(a) The term commerce means trade, traffic, commerce, transportation, or communication among the several States, or between the District of Columbia or any Territory of the United States and any State or other Territory, or between any foreign country and any State, Territory, or the District of Columbia, or within the District of Columbia, or any Territory, or between points in the same State but through any other State or any Territory or the District of Columbia or any foreign country.

(b) The term affecting commerce means in commerce, or burdening or obstructing commerce or the free flow of commerce, or having led or tending to lead to a labor-management dispute burdening or obstructing commerce or the free flow of commerce.

(c) The term labor union or labor organization means any organization of any kind, or any agency or employee representation committee or plan, 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 of employment, or conditions of work.

(d) The term State or other conciliation services means the official and accredited mediation and conciliation establishments of State and local governments, which are wholly or partially supported by public funds.

(e) The term proffer its services, as applied to the functions and duties of the Federal Mediation and Conciliation Service, means to make mediation services and facilities available either on its own motion or upon the request of one or more of the parties to a dispute.