THE F.B.I. is currently investigating the hacking of Americans’ computers by foreign governments. Russia is a prime suspect.

Imagine a possible connection between a candidate for president in the United States and the Russian computer hacking. Imagine the candidate has business dealings in Russia, and has publicly encouraged the Russians to hack the email of his opponent. It would not be surprising for the F.B.I. to include this candidate and his campaign staff in its confidential investigation of Russian computer hacking.

But it would be highly improper, and an abuse of power, for the F.B.I. to conduct such an investigation in the public eye, particularly on the eve of the election. It would be an abuse of power for the director of the F.B.I., absent compelling circumstances, to notify members of Congress that the candidate was under investigation. It would be an abuse of power if F.B.I. agents went so far as to obtain a search warrant and raid the candidate’s office tower, hauling out boxes of documents and computers in front of television cameras.

The F.B.I.’s job is to investigate, not to influence the outcome of an election.

Such acts could also be prohibited under the Hatch Act, which bars the use of an official position to influence an election. That is why the F.B.I. presumably would keep those aspects of an investigation confidential until after the election. The usual penalty for a violation is termination of federal employment.