The toughest of this week's stern official warnings against any demonstrations marking Solidarity's Aug. 31 anniversary came from the Baltic city port of Szczecin. The government has threatened to close down the Adolf Warski shipyard there in the event of trouble, Monitor correspondent Eric Bourne reports. The shipyard is a major installation of one of Poland's key industries.
A local newspaper carried an official warning Aug. 26 against any repetition next week of a march by shipyard workers Aug. 18 - a march that resulted in the dismissal of 39 workers. In the first specific threat of its kind, the paper's editorial stated the authorities would resort to ''the most drastic measures'' to isolate trouble inciters - for the public's benefit. The threat indicated the government's apparent readiness, if a demonstration is attempted, to shut down key industries, despite their importance to a fragile economy.
Later, the Polish primate, Archbishop Jozef Glemp, spelled out what the church sees as the conditions for easing the tensions between officialdom and society.
He was speaking at the peak day of the current 600-years jubilee of the revered picture of the ''Black Madonna'' at the Jasna Gora shrine at Czestochowa , southern Poland.
The church, he said, wants dialogue, based on these four points:
* Lech Walesa must be given the possibility to express his viewpoint as a free man.
* All other internees must be released.
* Talks for a new (Solidarity) union must be possible.
* A date must be fixed for the visit of the Pope. (Pope John Paul II had deferred a recent planned visit at the request of the Polish government.)