Pro`s collective agreement guarantees a level playing field of contractual relationship and fair compensation. The collective agreement guarantees the correct evolution of wages. To this end, he agrees with the minimum wages and general wage increases that form the basis of the employee compensation system. In addition, you can negotiate your personal increases. In 1931, the Supreme Court was appointed in the Texas – N.O.R. Co. Brotherhood of Railway Clerks case, upholding the prohibition of employer intervention in the selection of negotiators.  In 1962, President Kennedy signed an executive order that gives public employee unions the right to bargain collectively with federal authorities.  The United States covers the largest number of collective agreements in the private sector in the United States. The Act makes it illegal for employers to discriminate, spy, harass or terminate workers because of their union membership or to retaliate for organizing campaigns or other “concerted activities,” creating business unions or refusing to engage in collective bargaining with the union that represents their employees. It is also illegal to require any worker to join a union as a condition of employment.
 Trade unions are also able to ensure safe working conditions and adequate remuneration for their work. Collective agreements are agreements between employers and registered unions that cover workers in the employer`s workplace. Collective agreements are used to supplement legislation or to negotiate scope-specific contracts. The main principle is that collective agreements cannot contain terms that are less than the statutory requirements. The transmission of tariff conditions to individual employment contracts. Collective agreements of form, registration and publication must be written; Otherwise, they are annular (Article 4, paragraph 1, Collective Labour Relations Act). They must also be registered and published with the Ministry of Employment and Social Security. Registration is made 15 days after this filing, unless the department has informed the parties of its formal refusal, as is only permitted for the reasons mentioned in the legislation.