Jimmy Hoffa means of leveraging union strength at one company, to then move to organize workers, and finally to win contract demands at other companies. This process, which took several years starting in the early 1930s, eventually brought the Teamsters to a position of being one of the most powerful unions in the United States. Trucking unions in that era were heavily influenced by, and in many cases controlled by elements of, organized crime. For Hoffa to unify and expand trucking unions, he had to make accommodations and arrangements with many gangsters, beginning in the Detroit area. Organized crime influence on the
Trade union Germany, Finland, Norway, South Korea, Sweden, Switzerland, the UK and the US). These unions are often divided into "locals", and united in national federations. These federations themselves will affiliate with Internationals, such as the International Trade Union Confederation. However, in Japan, union organization is slightly different due to the presence of enterprise unions, i.e. unions that are specific to a specific plant or company. These enterprise unions, however, join industry-wide federations which in turn are members of Rengo, the Japanese national trade union confederation. In Western Europe, professional associations often carry out the functions of a trade union. In these