Tracey Service Co.

Opinion by

Price, J.,

In September, 1975 appellants were subpoenaed by the January, 1974 Philadelphia Special Investigating Grand Jury.1 The subpoena was approved in advance by Judge Bullock, Supervising Judge of the Grand Jury, and was *478issued in connection with an investigation. See In Re Falone, 464 Pa. 42, 346 A.2d 9 (1975) and In Re Martorano, 464 Pa. 66, 346 A.2d 22 (1975).

Motions to quash the subpoenas were filed before Judge Bullock, who, after receiving briefs and hearing arguments, and also obtaining an in camera disclosure of relevant facts from the Assistant Attorney General in…