In 1979, the party abandoned its definitive Marxist theses at the hands of its then secretary general Felipe González, not before overcoming great tensions and two congresses, the first of which preferred to maintain Marxism.
En 1979 o partido abandonou definitivamente as teses marxistas, da man do seu entón secretario xeral Felipe González, non sen antes superar grandes tensións e dous Congresos, o primeiro deles favorable a manter o marxismo.