BUCHAREST, Rumania, Jan. 21— Student leaders, addressing a crowd of about 3,000 of their classmates today, demanded far-reaching changes in the faculties of Bucharest University and other Rumanian institutions of higher learning.

The strongest demand, and the one cheered most loudly by the students, was for the ouster of professors most closely associated with the Communist dictatorship of the late Nicolae Ceausescu, particularly those working for the Securitate, or state security police.

”There are Securitate officers on the journalism faculty,” a student, Daniel Oghian, declared. He assailed Professor Radu Florian as a Ceausescu holdover whose advocacy of Communist ideology was particularly objectionable. Mr. Florian is a member of the Stefan Gheorgiu Academy, where Securitate officials were trained. The academy was grafted onto Bucharest University under the Ceausescu Government.

”Down with Florian!” the students chanted. ”Down with Stefan Gheorgiu! Depoliticize! Depoliticize!” ‘Militarized’ Classrooms Mihai Iliescu, a physics student, drew cheers when he declared that incompetent professors should be sent back to ”study their lessons over again” or be forced to resign. He also called for the ouster of the Ministry of Education’s inspector of universities.

Another speaker, from the Marine Sciences Institute in Constanta, said that his college had been ”militarized” and subjected to Securitate control under Mr. Ceausescu. Conditions were such that students were quartered 50 to a single room, he said, and buildings were unheated.

”Take it over!” the students shouted. ”Take it over!” It was the second rally in two weeks in the capital. The first was held at the Polytechnical Institute in western Bucharest. But this time the students gathered in University Square in the middle of the city under the auspices of a newly-formed Student League.

In passionate speeches commemorating classmates who were killed in the uprising that toppled the Ceausescu regime four weeks ago, the students said they wanted to create ”a new society” and ”a strong Rumania.”

”We speak from our hearts for those who were killed in the revolution,” said Mihai Gheorghiu, a third-year philosophy student. Dan Josif, another student, said, ”They fought with weapons, and we carried flowers.”

Government Is Silent on Protest

The students, many cradling lighted candles in their hands, bowed their heads in a minute of silence for their slain classmates, then raised their voices in four stanzas of the long-banned hymn ”Awake, Ye Rumanians,” which denounces ”barbarians and tyrants.”

There were no Government spokesmen at the rally. Nor was there any immediate reaction from the governing Council of National Salvation, although its President, Ion Iliescu, met with youth leaders today to discuss a future group for Rumanian young people to replace the Communist youth organization.

It has generally been impossible to obtain precise information about or reactions to daily events in Rumania from the Government, which closed its foreign press and telephone service on Saturday, even from its spokesman, although he holds periodic news conferences.

On Thursday morning, for example, a plainclothes officer of the pro-Ceausescu Securitate suddenly emerged from a manhole on Nicolae Balcescu Boulevard, the main north-south thoroughfare. He was immediately detained by passers-by, who were evidently aware that in recent weeks the Securitate forces had used a vast network of underground tunnels for hit-and-run attacks on the Rumanian Army units that joined the uprising.

In a short time, armed soldiers gathered at the manhole and brought out another 16 Securitate officers who had been living in the tunnels for nearly a month. Down the street that same day, four more Securitate officers turned themselves in to an army unit in front of the Plaza Building, saying they were starving.

This was revealed by two associates of Cristian Popisteanu, editor in chief of Magazin Istoric, who witnessed the incidents. But so far, no word of what happened has appeared in the Bucharest press or on television.

Photos: Students in Bucharest demonstrating yesterday for far-reaching changes at universities, including the ouster of faculty members the students say were supporters of the deposed dictator, Nicolae Ceausescu. (AP); A student at the rally mourning a relative killed in the revolution. (Reuters)

———————————————————————————————————–