About 1,000 Poles protested price increases and chanted slogans supporting the outlawed Solidarity union after a Roman Catholic Mass in the southern city of Krakow, an opposition source said. Last Monday, the price of food was increased an average of 40%, gasoline prices jumped by 60% and housing costs went up 50%. In Warsaw, police broke up a meeting of the illegal Polish Socialist Party and detained six activists, including leader Jan Jozef Lipski, for several hours, a party spokesman said. It was the sixth time a meeting has been broken up by police since the party was revived in November. The party was disbanded in 1948 after the left wing merged with the Polish Communist Party.