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Wiktionary
agency shop

n. A place of employment in which a union receives dues or the equivalent for all employees excluding management, and bargains for all such employees whether or not they are members of the union.

Wikipedia
Agency shop

An agency shop is a form of union security agreement where the employer may hire union or non-union workers, and employees need not join the union in order to remain employed. However, the non-union worker must pay a fee to cover collective bargaining costs. The fee paid by non-union members under the agency shop is known as the "agency fee".

Where the agency shop is illegal, as is common in labor law governing American public sector unions, a "fair share provision" may be agreed to by the union and the employer. The provision requires non-union employees to pay a "fair share fee" to cover the costs of the union's collective bargaining activities. The "fair share" is similar to the agency shop, but usually more restrictive as to what may be charged to the non-member. In Canada, the agency fee is usually known as the Rand formula. Thus, in the United States' public sector, employees of the employer are entitled to not be members of the union, but they can be required to pay the documented costs of contract administration and negotiation. If they object, typically such a determination is submitted for hearing to a neutral arbitrator who will take evidence and render a final and binding decision as to the propriety of the fees assessed.

International Labour Organization covenants do not address the legality of agency fee provisions, leaving the question up to each individual nation. The legal status of agency shop agreements varies widely from country to country, ranging from bans on the agreement to extensive regulation of the agreement to not mentioning it at all.