The U.S. government does not authorize the union shop in any federal authority, whether state law permits it or not. A trade union shop, also known as a post-entry shop, is a form of union security clause. The employer agrees either to recruit only union members or to require all new employees who are not yet unionized to become members within a specified time frame.  The use of trade union activities varies considerably from country to country, depending on the level of protection generally granted to trade unions. Under U.S. labour law, a private sector union may expel a member of an arbitrary union as long as it provides the member with the statutory minimum worker reporting and disclosure procedure (LMRDA) and does not do so for reasons prohibited by law (such as the member`s race or protected political activities within the union). On the other hand, the union cannot require, by a union enterprise contract, that an employer dismiss a member because it does not maintain a reputable membership, unless that member has been excluded from the union because it has not paid uniformly required union dues and fees. If the union excludes a member for any reason other than non-payment of dues, it virtually terminates any right that it should have required the worker to be due after or must require that the worker be dismissed for non-compliance. Note: State law determines whether a collective agreement can have a clause in the creation of a trade union activity. Many states with labour laws prohibit trade union trade agreements. In 1996, 62.1% of Japan`s collective agreements included a trade union rule.  In 1999, 60% did so.
 Other forms of union security agreements, such as the closed store and the agency shop, are extremely rare.  Unions charge fees to members and others who support them. These fees pay for union-provided benefits, such as health insurance, and cover a variety of expenses, including political lobbying and campaign contributions. However, unions have strict rules imposed by the NRL on what they can and cannot say, what some people say inside can hinder their ability to actually represent people. All forms of closed transactions in the UK are illegal after the introduction of the Employment Act in 1990. They were further reduced under Section 137 (1) (a) of the Trade Union and Labour Relations (Consolidation) Act 1992 (approximately 52) , which was passed at the time by the Conservative government. The then-opposition Labour Party had supported closed operations until December 1989, when it abandoned the policy in accordance with EU law.  Equity was one of the last unions in the United Kingdom to sell a closed store before entering the meeting.  The union shop has ensured that workers join a particular union and must pay taxes within a specified period of time after the start of employment, usually 30 to 90 days. Such regulation ensures that workers pay the benefits of union representation. A union shop is less restrictive than a closed store that prevents employers from hiring outside the union.
For the entertainment industry, unions representing performers have the most important rule that prohibits all actors represented from working on a non-union production. Sanctions are imposed on the trade unionist and not on the employer and may result in a loss of union membership. Most of the major productions are union productions, and non-members join the Screen Actors Guild by acting as extras and winning three union vouchers or receiving a line of speech and entering in this way.