They also said that at a meeting of the Mongolian legislature beginning on March 21, the committee would probably end the constitutional monopoly of power for the ruling party.

Under popular pressure, he has gradually conceded that ending the party's constitutional monopoly on political power in the Soviet Union would not be "tragic."

To bolster its political strength, the movement is discussing plans to form itself into a political party now that the Communists have foresworn their constitutional monopoly on power.

The group takes in most of the political parties that have formed since the Communists lost their constitutional monopoly on power last year.

Mr. Gorbachev had argued until recently that it was too early to abolish the party's constitutional monopoly.

In 1990 the National Assembly abolished the party's constitutional monopoly on political power and established a transitional government.

The Soviet Communist Party adopted a platform last week endorsing the abolition of the party's constitutional monopoly on political power and other changes.

The measure was proposed by Mr. Gorbachev in tandem with his recent concession that the Communist Party might consider yielding its constitutional monopoly on power.

Cuba's reassertion of one-party rule follows a decision last week by the Soviet Communist Party, its former political mentor, to abandon a constitutional monopoly on power.

After the Central Committee voted last week to give up the party's constitutional monopoly on political power, criticism of the party has become surprisingly open.