The Red Brigades' release this morning of city magistrate Giovannie d'Urson, after 33 days of captivity, brought to an end Italy's most dramatic terrorist episode since the kidnaping and murder of former Premier Aldo Moro almost three years ago.

Following a message from the Marxist terrorists that they would free "the hangman," D'Urso was discoverd, bound, gagged and wearing a headset blaring music from a cassette, under blankets in the back seat of a Fiat.

The stolen car was only 250 yards away from the Ministry of Justice where D'Urso worked and the same distance from where Moro's body was dumped in 1978.

[Later police announced that they had arrested one man and a judge had issued warrants for six others in the case, United Press International reported. The detained 25-year-old, whose name was not given, also was accused of participating in the assassination of police Gen. Enrico Gavaligi Dec. 31.]

D'Urso, 49, heavily bearded and dressed in the same clothes he was wearing the day he was kidnaped, embraced the policemen who freed him from his bonds, requested that his family be notified, and asked for coffee and a cigarette. He later told investigating magistrate Domenico Sica that his captors left their hideout about 4 a.m. and drove for about two hours, changing cars twice. He was in good health and he said he was not mistreated physically.

The release of D'Urso, a high-ranking official of the italian penal system, came only a few hours after the parliament resumed a debate over the government's handling of the case -- which included shutting down one prison and releasing a terminally ill Red Brigades prisoner.

It is expected to lead to a vote of confidence in Christian Democratic Premier Arnaldo Forlani's four-party coalition government, under sharp attack by the Communists and other political groups for allegegly giving in to "soft-line" pressures from the Socialists, a coalition member.

D'Urso was taken to police headquarters to be reunited with his wife Franca, who appears almost single-handledly to have won the battle for her husband's release by persuading two newspapers to publish terrorist tracts as demanded.