P284 284 YLE TEKSTI-TV 21.06. 2224:03   NEWS IN ENGLISH Tuesday  Chilean strike call Chilean trade unions have called for an indefinite strike beginning Thu. The decision was announced shortly after a judge ordered the imprisonment of six leaders of the union represent- ing striking copper workers. The unions behind the strike call claim to represent about a third of the country's workforce. Copper miners began their strike last Thursday. Pres. Pinochet last week said he would crack down on those who violate the ban on political activity. Soviet diplomat expelled 285 INDEX 280