Eight Romanians have signed a letter protesting "all forms of psychic, moral and intellectual oppression." It was the first indication that the dissident movement that has spread recently through the Soviet bloc has taken hold in Romania.

The letter surfaced in Belgrade, Yugoslavia, and was addressed to the organizers of the Belgrade conference that will meet in June to review the 1975 Helsinki declaration dealing with human rights. The statement was written by novelist Paul Goma.

There were these other developments involving the dissident movement in Eastern Europe:

Aallard K. Lowenstein, chief of the U.S. delegation to the U.N. Human Rights Commission in Geneva, Switzerland, said he had held talks with Soviet representative Valerian Zorin about recent arrests of dissidents in the Soviet Union.

The Canadian Parliament approved a motion censuring the Soviet Union for arresting human-rights activists.

Walter Kratzer, a correspondent for the West German magazine Stern, was taken off a Prague-to-Vienna train by Czechoslovakian police, searched for material on the human rights movement and forced to walk with his baggage two two miles to the Austrian border. A New York Times reporter was similarly treated by Czechoslovak police last weekend.

Yugoslavia accused the West of "poisoning the atmosphere" for the upcoming meeting on the Helsinki declaration by dwelling on the human-rights issue.