The following are excerpts from an unofficial text obtained by The Washington Post of the letter sent to the Central Committee of the Polish Communist Party from the Central Committee of the Soviet Communist Party. It is dated June 5, 1981. Dear comrades:

The Central Committee of the Soviet Communist Party addresses itself to you in this letter out of profound anxiety for the fate of socialist Poland and for Poland as a free and independent country. . . . The Polish and Soviet communists have fought shoulder to shoulder in the battle against fascism and have been together in all the postwar years. Our party and the people of the Soviet Union have helped the Polish party in the building of a new life and we therefore cannot but be disquieted by all that presently threatens your revolutionary conquests.

The Polish nation is in mortal danger. We say so openly. Certain tendencies in Poland's development, particularly in ideological and economic policy of the former leadership, have provoked our anxiety over many years. In full accord with the spirit of relations that existed between [our] parties, we spoke of this to the Polish leaders during many meetings at the highest level. Unfortunately these friendly warnings, in common with deeply critical declarations aired by Polish communists inside the Polish party, were not taken into consideration. pThey were ignored. In consequence, a profound crisis broke out in Poland which spread to the entire political life of the country.

The changes in the leadership of the Polish Communist Party, the efforts to overcome the great errors of the past . . . were intended to regain popular confidence in the party and reinforce socialist democracy. All these attempts met with our full understanding. From the start of the crisis, we thought it important that the party should oppose decisively all attempts by the enemies of socialism to take advantage of the difficulties for their long-term aims. This has not been done.

The enemies of socialist Poland are not hiding their intentions. They are in fact conducting a struggle for power and are already winning. They are gaining one position after another. The counterrevolution is using the extremist wing in Solidarity, making use of workers who joined this professional union for their criminal plot against the people's authority. A wave of anticommunism and anti-Sovietism is developing. Imperalist forces are making ever more open attempts to interfere in Poland's internal affairs. . . .

[During meetings between Soviet and Polish leaders] we underlined our anxiety about counterrevolutionary forces and the need to defend the people's authority. Particular attention was drawn to the fact that the enemies had gained control of the mass media which was being influenced by antisocialists in order to destroy socialism and the party. Attention was also drawn to the fact that the battle cannot be won as long as the radio and television worked not for the party, but for the enemy. We also urged the need for a reinforcement in the forces of public order and the Army in the face of the ambitions of counterrevolutionary forces.

To allow attempts to slander and dismantle the security organs, militia, and subsequently the Army, too, implies in fact the disarmament of the socialist state and its abandonment to the mercy of the class enemy.

We wish to underline that in all these questions Kania and Jaruzelski and other Polish comrades expressed agreement to our point of view. But in fact, nothing changed and there was no correction to the policy of concessions and compromise. One position after another is being ceded, ignoring the documents from the past plenum which stated that there was a danger of counterrevolution. In practice, not a single measure has been taken so far to confront it.

Recently the situation inside the party has also caused our particular concern. No more than a month is left before the party congress. Yet the antisocialist forces are setting the tone for the electoral campaign. . . . People openly expressing opportunists' views are being elected to the leaderships of local party organizations. . . . And activists with irreproachable reputations and morals are being pushed out. . . .

Preparation for the congress are also complicated by the so-called movement of horizontal structures. This is a movement for the dismantling of the party. . . . One must not exclude the possibility that during the congress itself an attempt could be made to strike a decisive blow against the Marxist-Leninist forces in the party and to liquidate the party itself.

During the last few months the counterrevoluntionary forces have increasingly been disseminating anti-Soviet views. This is designed to eradicate all the progress achieved by our two parties, to resurrect once again nationalist and anti-Soviet sentiments in Polish society. These slanderers and liars stop at nothing. They say the Soviet Union is plundering Poland when it is well known that the Soviet Union is providing enormous supplementary material aid to Poland in this difficult period. This is being said about the country whose deliveries of oil, cotton, gas, and minerals at prices one to two times lower than world prices -- furnish the principal branches of Polish industry. . . .

We think the possibility of avoiding a national catastrophe still exists. . . . It is now necessary to mobilize all healthy forces to confront the class enemy and fight the counterrevolution. aThis calls for a revolutionary will of the party, of its militants, and of its leadership. Yes, of its leadership. Time does not wait.The party can and should find within itself forces to reverse the course of events and put things into order, in goodwill, even before the congress.

We would like to believe that the Central Committee of the Polish sister party will be able to face its historic responsibilities. We wish to assure you, dear comrades, that in these difficult days, as always in the past, the Central Committee of the Soviet Communist Party, all Soviet communists, the entire Soviet people are with you in their fight.

Our point of view was expressed with precision by comrade Brezhnev in his speech to the 26th Congress. "We shall not abandon the sisterly socialist Poland. We shall not let it be harmed."

[Signed] The Central Committee of the Soviet Communist Party.