Unions emerged to mediate the relationship between workers and employees and ensure that workers' rights would be guaranteed.
A worker alone has less bargaining power with his boss. In this way, trade unions jointly negotiated working conditions such as time and wages (1).
In addition, trade unions negotiated physical conditions of work, avoiding abuses that could endanger workers' health (2).
Finally, a third point was that the unions facilitated the search for jobs (3), intermediation between the needs of the sectors and the workers suitable for each sector.