In 1977, the Marxist Workers' League, associated with the Organising Committee for the Reconstruction of the Fourth International, joined the party.

In 1981, the federal government recognized the PRT as an official nationwide party.

[3] During the latter half of the 1980s, the PRT began to face a series of crises and in-fighting as its progress slowed.

In 1987, the PRT refused to join the merger of five parties/organizations which became the Mexican Socialist Party (PMS).

In 1996, after losing federal recognition, what remained of the PRT (led by Edgard Sánchez Ramírez) formed Socialist Convergence.