Soon after its official registration on March 1, the PLS was invited by the governing National Salvation Front (FSN) to join Romania's temporary legislature, or Provisional National Unity Council (CPUN). Its one seat there was taken by Cazimir. With Cazimir as president, seconded by Gheorghe Boșman, the party held its first congress at Cervantes High School, Bucharest, shortly before the 1990 general elections. The PLS benefited from the liberal electoral law of that period, which required registrations to have only 251 signatures. Politician and scholar Cristian Preda places the PLS in a category of ephemeral groups created in that interval, alongside a Romanian Democratic Popular Realist Revolutionary Party and a Party of Heroes Killed for the Freedom of Living Heroes Maimed by the Barbarian Bullets.