8th Trade Union congress in Warsaw.
A Trade Union is an organisation of workers in a particular trade or profession, formed to represent their interests and deal as a group with employers.
Kongres Związków Zawodowych - Maj 1949 = Congress of the Trade Unions - May 1949.
Socjalizm = Socialism.
Pokój = Peace.
Praca = Labour.
Find other Polish stamps that commemorate trade union congresses