At the time of its foundation, PSN supported the regime of Anastasio Somoza García.

[1] From 1976 onwards there was a PSN breakaway group, called the Nicaraguan Socialist Party (de los Sánchez).

Towards the end of the Somoza regime, the PSN established the Organización Militar del Pueblo (Military Organization of the People).

In 1990 PSN joined hands with right-wing forces in the National Opposition Union to topple the Sandinista government.

For the 2006 Nicaraguan general election, it joined with the Sandinista Renovation Movement.