Solidarity (, pronounced ; full name:
Independent Self-governing Trade Union "Solidarity" –
Niezalezny Samorzadny Zwiazek Zawodowy „Solidarnosc” ) is a
Polish trade union that was founded on 17 September 1980 at the
Gdansk Shipyard under the leadership of
Lech Walesa. It was the first trade union in a
Warsaw Pact country that was not controlled by a
communist party. Its membership reached 9.5 million members before its September 1981 Congress (when it reached 10 million), which constituted one third of the total working-age population of Poland.