A dramatic process of reorganization and regrouping within the Mexican left, culminated in the formal dissolution of the Mexican Communist Party (PCM) and the creation of a new broad left party, the United Socialist Party of Mexico (PSUM) in 1981. By 1985, there were three independent socialist/marxist parties represented in the Chamber of Deputies; the Mexican Workers Party in addition to the "left-wing" parties of the so-called loyal opposition, the Socialist Popular Party and the Socialist Workers Party. PSUM was founded in November 1981 after a merger between five political parties and tendencies, of which the most important, and by far the biggest, was the PCM. The PSUM emerged remarkably quickly; only four months elapsed between the first announcement of the holding of discussions on a merger and the formal emergence of the PSUM in November.