The executive branch
Hatch Act
The 1939 law limiting partisan political activity by federal employees, so the public workforce cannot be turned into a campaign operation.
In full
Career employees may vote, donate, and belong to a party, but may not engage in political activity while on duty, in a federal building, or using a government vehicle or title, and may not run in a partisan election. Restrictions are tighter for certain agencies and looser for the President and Vice President, who are exempt. The Office of Special Counsel enforces it.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.