states:
"On September 9, 1980, we issued a presentment charging four employees, David Bohannon, Richard Drapczuk, John Majewski and Richard Wolf with participation in the conspiracy to defraud the City.
Our investigation continued after charges were filed against the four individuals. Our goal was to determine whether other Mrs. Paul's employees, higher in the corporate structure, were involved in the scheme to defraud the City.
To that end, in late March, 1981, the four individuals who had been charged were subpoenaed to appear before us and were subsequently granted immunity.
In April, each of the four appeared before us. It was our desire to hear their testimony. However, despite the immunity grants, three of the individuals refused to answer questions and were held in contempt by Judge David Savitt, the Supervising Judge.subpoenaed before the grand jury on February 23, 1981, ostensibly to inquire about possible involvement in the alleged conspiracy by Drapczuk's superiors. He presented a motion to quash the subpoena to Judge Savitt, the supervising judge of the grand jury, which motion was denied on March 26, 1981. Having been informed of Drapczuk's intention to refuse to testify before the grand jury on self-incrimination grounds, the Commonwealth petitioned Judge Savitt for a grant of immunity pursuant to section 5947 of the Judicial Code, 42 Pa.C.S.A. § 5947, which petition was granted on March 30, 1981 over petitioner's objection.
After being sworn before the grand jury on that same day, Drapczuk read a prepared statement to the jury in which he declined to answer any questions. His reasons set forth