The <a href="https://en.wikipedia.org/wiki/Solidarity_(Polish_trade_union)" id="mw_Q" rel="mw:WikiLink" title="Solidarity (Polish trade union)">Solidarity</a> movement in Poland stages a <a href="https://en.wikipedia.org/wiki/1981_warning_strike_in_Poland" id="mw_g" rel="mw:WikiLink" title="1981 warning strike in Poland">warning strike</a>, in which at least 12 million Poles walk off their jobs for four hours.