What is "prasa-ksiazka-ruch"

The RSW Prasa-Książka-Ruch literally the Workers' Publishing Cooperative abbreviated to RSW , was a state-owned newspaper monopoly in communist Poland founded on 1 January 1973 by the Polish United Workers' Party (PZPR). It operated a system of printing houses and distribution outlets (see also: Empik), and owned vast real estate including resort and recreation property also rented out.