Department Of Homeland Security:
Operational Readiness Order HQ-ORO-002-2018

Transportation Security Administration: 

"Can I film and take photos at a security checkpoint?"

United States Postal Inspector: 

Poster 7 governing conduct on postal property

International Association of Chiefs of Police: 

Recording Police Activity

5 CFR 2635.101 "Basic Obligation of Public Service" — Public service is a public trust, requiring employees to place loyalty to the Constitution, the laws and ethical principles above private gain.

33 CFR 105.260 "Security Measures for Restricted Areas"(a) General.The facility owner or operator must ensure the designation of restricted areas. They must: (#6) Clearly mark all restricted areas and indicate that access to the area is restricted and that unauthorized presence within the area constitutes a breach of security; (#7) Control the entry, parking, loading and unloading of vehicles.

39 CFR § 232.1 "Conduct on postal property" - (e) Disturbances. Disorderly conduct, or conduct which creates loud and unusual noise, or which impedes ingress to or egress from post offices, or otherwise obstructs the usual use of entrances, foyers, corridors, offices, elevators, stairways, and parking lots, or which otherwise tends to impede or disturb the public employees in the performance of their duties, or which otherwise impedes or disturbs the general public in transacting business or obtaining the services provided on property, is prohibited. (i) Photographs for news, advertising, or commercial purposes. Except as prohibited by official signs or the directions of security force personnel or other authorized personnel, or a Federal court order or rule, photographs for news purposes may be taken in entrances, lobbies, foyers, corridors, or auditoriums when used for public meetings. Other photographs may be taken only with the permission of the local postmaster or installation head.

39 CFR, 1-F, §447.21 "Prohibited Conduct" - (c) No employee while acting in his official capacity shall directly or indirectly authorize, permit, or participate in any action, event or course of conduct which subjects any person to discrimination, or results in any person being discriminated against, on the basis of race, color, religion, sex, national origin, or age. (d) No employee shall engage in criminal, dishonest, notoriously disgraceful or immoral conduct, or other conduct prejudicial to the Postal Service. Conviction of a violation of any criminal statute may be grounds for disciplinary action by the Postal Service in addition to any other penalty imposed by or pursuant to statute.

41 CFR 102-74.420 "What is the policy concerning photographs for news, advertising or commercial purposes?" — Except where security regulations, rules, orders, or directives apply or a Federal court order or rule prohibits it, persons entering in or on Federal property may take photographs of (a) Space occupied by a tenant agency for non-commercial purposes only with the permission of the occupying agency concerned; (b) Space occupied by a tenant agency for commercial purposes only with written permission of an authorized official of the occupying agency concerned; and (c) Building entrances, lobbies, foyers, corridors, or auditoriums for news purposes.

4 USC §8 - “Respect for flag” — No disrespect should be shown to the flag of the United States of America. (g) The flag should never have placed upon it, nor on any part of it, nor attached to it any mark, insignia, letter, word, figure, design, picture, or drawing of any nature.

42 USC §1983 "Deprivation of Rights" — Every person who, under color of any statute, ordinance, regulation, custom, or usage, of any State or Territory or the District of Columbia, subjects, or causes to be subjected, any citizen of the United States or other person within the jurisdiction thereof to the deprivation of any rights, privileges, or immunities secured by the Constitution and laws, shall be liable to the party injured in an action at law, suit in equity, or other proper proceeding for redress.

18 USC § 241 "Conspiracy Against Rights" — If two or more persons conspire to injure, oppress, threaten, or intimidate any person in any State, Territory, Commonwealth, Possession, or District in the free exercise or enjoyment of any right or privilege secured to him by the Constitution or laws of the United States, or because of his having so exercised the same.