Estados Unidos de América - Employer interference:

Workers have no right to conduct meetings in the workplace without management being present. Union meetings must normally be conducted on nonworking time, off the employers’ premises. Additionally, although it is illegal for an employer to dominate or interfere with the formation or administration of a union or to contribute financial or other support to it, violations of the law do occur. In fiscal year 2010, the last year for which the government collected this data, 539 charges alleging violations of the prohibition against employer domination or interference with a union were filed. These charges constituted 3.1% of the 17, 145 unfair labour practices filed against employers by workers and unions that year.