More than 200,000 Serbs rallied Saturday in four towns to push demands for Serbian control over two neighboring autonomous provinces.

The Communist Party leader of the northern republic of Slovenia said meanwhile that the country is "on the threshold of imposing emergency measures" after violent demonstrations."We have to sober up and stop this insanity," said leader Milan Kucan.

His speech at an official rally in Slovenia came during intense politicking before a meeting of the national Communist Party's Central Committee. The meeting, starting Monday, is expected to shake up Yugoslavia's leadership during its worst crisis since World War II.

Hundreds of thousands of Serbs demonstrated in Sombor in autonomous Vojvodina province near the Hungarian border; and in Leskovac, 90 miles south of Belgrade in the republic of Serbia. Two smaller demonstrations occurred in Indija in Serbia and in Stara Pazova in Vojvodina.

No violence was reported, but all of the protesters pledged allegiance to Slobodan Milosevic, the Serbian party chief, in what has now become a daily phenomenon.

Milosevic wants Serbia, one of Yugoslavia's six republics, to be given more control over Vojvodina and another autonomous province, Kosovo.

Kosovo, which was once inhabited mostly by Serbs, is now predominantly ethnic Albanian. Serbs accuse Kosovo's leadership of discriminating against Kosovo's Serbian residents.

Milosevic's push has alarmed non-Serb leaders and has prompted outcries that his policies may tear Yugoslavia apart.