patory judicial involvement in criminal investiga- tions."), cert denied, 440 U.S. 949, 99 S.Ct. 1431, 59 LEcI2d 639 (1979) (Reporters Committee); LaRouche v. Webster, 566 FSupp. 415, 417 (S.D.N.Y.1983) ("party seeking to enjoin a criminal investigation bears an almost insurmountable burden") (LaRouc