This was the first law firm I worked for, the first case, the first appeal, etc. The lower court decision is linked here too and should be read (I had also worked on that motion):
United States of America, Appellee, v. E. Garrison St. Clair, Appellant, 552 F.2d 57 (2d Cir. 1977):
The district court relied on portions of the House committee report which indicate that a principal objective of § 1510 was the protection of informants and potential witnesses. However, nothing in the report supports the district court’s conclusion that this was the only purpose. The court apparently took the second sentence of the following paragraph out of context:
This committee wishes to make it abundantly clear that this legislation cannot be used by a Federal investigator to intimidate or harass a potential witness or informant by reason of his giving false or misleading information about a criminal violation. The sole purpose of the act is to protect informants and witnesses against intimidation or injury by third parties with the purpose of preventing or discouraging the informants or witnesses from supplying or communicating information to the Federal investigator. The informants or witnesses cannot themselves be subject to prosecution under this act on account of any information they may furnish to the investigator.”
H.R.Rep.No. 658, supra.