The Greylord cases have shaken public confidence in the Circuit Court, and prompted Chief Judge Harry G. Comerford last week to form a 36- member panel of lawyers, businessmen and representatives of the public to ''call attention to what is bad, note what is good and, above all, suggest ways for us to improve this court system.''

Judge Laurie had insisted that he was not guilty, and had questioned the investigatory tactics used in Operation Greylord. These included the use of contrived cases, in which defendants, victims and lawyers served as undercover agents.

The judge's attorneys, Patrick A. Tuite and David Mejia, had also accused the Government of bolstering its case by altering tape recordings of conversations involving the judge and an undercover agent, Terrence Hake. 'They Fooled With Tapes'

After the verdict was announced, Mr. Tuite told reporters: ''Anybody who sat through the trial and saw how they fooled with tapes should be outraged. I'm glad that we were able to show that to this jury.''

The evidence presented by the Federal prosecutors was essentially the same that had been used in previous trials: the testimony of Mr. Hake, tapes and testimony of witnesses who said they had either paid the judge or acted as conduits in the bribe scheme.

The key witnesses were two former police officers, James LeFevour and James Trunzo, and a lawyer, Martin Schacter. All three had faced felony charges, but in return for their cooperation they will be allowed to plead guilty to misdemeanors.

Mr. Tuite said Mr. LeFevour had been an alcoholic for 20 years and ''can't tell fact from fantasy.''