The tens of thousands of Polish people who have defied martial law in a massive outpouring of sup- port for t e So idarity union have demonstrated once again the powerful yearning of oppressed Poles for freedom. Braving tear gas, con- cussion grenades and water cannons, citizens in many cities marked the second anniversary of the indeplendent union by marc ing toward Commu- nist Party headquarters chanting, ‘Free Lech Wal- esa” and “Solidarity, Soli- darity, Solidarity!” Walesa, interned Soli- darity leader, has been held since martial law began last Dec. 13 in a crackdown by the ruling military junta that ended a 16-month “taste of free-