By 1979 CS was part of a growing campaign for a new Workers' Party and played an important role in the metal working strikes that took place in the ABC region that year. In January the PST fully integrated itself into the CS ending its separate organisational form. The following year again saw CS taking a role in the important 40-day strike in the ABC region. Its own growth was marked by the attendance of 3,000 people at a rally of the CS and Moreno's international tendency, then linked to Pierre Lambert's France-based tendency. By 1982 Moreno and Lambert had parted company and the former organised the International Workers' League (Fourth International) to which CS affiliated.