In the largest protest rally in post-Communist Poland, about 25,000 union members marched to government headquarters Friday to demand an end to anti-inflationary wage controls.

The workers, who carried signs with messages such as "Tax in the factories, hunger at home," booed the nation's finance minister when he waded into the crowd outside the Council of Ministers building to speak to them.The so-called wage tax penalizes state firms that increase wages above levels set by the government. It was imposed by Poland's new government after Communist rule ended in 1989.

Finance Minister Leszek Balcerowicz's attempt to explain the government's side of the wage control issue was met with boos.