Summary

Pierce Butler Donnelley v. United States — Opinion of the Court

Those who drafted and passed the enforcement act knew that national prohibition would be assailed by influences more powerful than those that had embarrassed earlier and less sweeping state laws. Experience had shown that it would not do to leave prohibition enforcement officers free to determine what cases should be prosecuted and what ignored, and that mere imposition of duty to report offenders would not be enough. The infliction of punishment for their intentional violations is an appropriate measure to hold them to the performance of their duties.
Source: Wikisource

Pierce Butler Donnelley v. United States — Opinion of the Court

Undoubtedly Congress intended to penalize their violation of the duties imposed on them. And, unless it is to be restricted by implication in favor of enforcement officers, the general language used also covers violations of the provisions enacted to govern their official conduct.
But there is no support for a construction so restrained. It always has been deemed necessary to enact laws to compel performance of duty and to prevent corruption on the part of public officers. They are not attended by any special presumption that general language in disciplinary measures does not extend to them.
Source: Wikisource

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