A union security contract is a contractual contract that is generally part of a collective agreement in which an employer and a trade unionist agree on the extent to which the union may compel workers to enter the union and/or if the employer, on behalf of the union, collects dues, fees and assessments.  In June 2018, the U.S. Supreme Court ruled in Janus` favor in a 5-4 decision and stated that “states and public sector unions can no longer deduct agency fees from non-consensual workers.”  Janus v. American Federation of State, County, and Municipal Employees, Council 31, US (2018) is a case of U.S. labor law in which it comes to whether governments violate the First Amendment when they ask their employees to pay a union fee as a condition of employment. However, many countries have not addressed the issue of trade union security agreements. Neither Indonesian nor Thai labour law address this issue, and collective bargaining, union administrative procedures and tolls in both countries are so low that trade union security issues are scarce.  In Australia, the legal status of union security agreements varies considerably from state to state and from national government over time. Australia`s labour law does not explicitly provide for union rights security agreements. However, several forms of trade union-security agreement have been favoured at one time or another by the state, territory or national government, effectively regulating the type of union security agreements preferred and penalizing their other forms.
 Therefore, the incentive is for individual workers to “drive for free” by not paying the fees, which can lead to the collapse of the union and the absence of a collective agreement.  If the union collapses, any worker could be worse than if the union had negotiated the contract.  Eu security agreements are a means of ensuring that all (or almost) workers bear their fair share of the cost of collective bargaining (for example). B union membership and dues).   The problem of parasitism is often used to justify union security agreements. A classic study on the problem of parasitism is presented in Mancur Olson`s 1965 work, The Logic of Collective Action.  In labour relations, there is the problem of parasitists, because the cost of organizing a union and negotiating a contract with the employer can be very high, and because employers will find it too expensive to introduce multiple pay and benefit scales, some or all non-union members may find that the contract also benefits them.  Outside North America and Western Europe, the legal status of trade union security agreements is even more different. In New Zealand, the closed store was mandatory from 1988, when a union organized the workplace.  In the Philippines, different types of trade union security agreements are authorized by labour law.  In Mexico, the closed store was mandatory until the early 1990s, when a change in federal law allowed union stores, agency stores or no agreements.   But because of the political ties between unions and the ruling party in Mexico and other ways in which Mexican law favours established unions, the closed store remains essentially the norm.
 There are different types of union security agreements. Among the most frequent: one solution is for the state to provide rights (such as the right to manage social or pension funds or participation in an enterprise committee) or benefits (such as unemployment insurance) only for unions or their members.   Another solution is for unions to conduct collective collective bargaining that limits the benefits of the contract to union members.   In February 2015, the Republican Governor of Illinois, Bruce Rauner, filed an appeal alleging that the equitable sharing agreements were contrary to the Constitution