Targeting another player has always been against the rules, does not matter what CG server you are on.
It is considered trolling, or minging.
So, all in all, a bad idea? Probably. Could there be repercussions for, effectively, disrespecting Admins? Yup.
This is how I see it: These guys go after an admin, who is trying to do their job on the server. They knife him round after round. Does the victim get upset? Probably. Does it interfere with his attempting to admin? Most likely. Admin doles out bans for Admin disrespect. You complain. Cortez steps in, sees what has happened, and would probably not be happy with you. You probably would complain further. Cadaver steps in, sees what has happened, and probably extends your ban...
So, seeing how I see it, do you think this is really a good idea?
I. Rules:
1. Names need to consist of some English letters and be easily pronounced.
2. Do not RDM! (See section V)
3. Treat everybody with courtesy and respect.
4. Be conservative on mic use. (This means no singing, spamming, etc.)
5. No ghosting, cheating, hacking, or giving yourself an unfair advantage in anyway.
6. Anyone found to be excessively annoying will be muted / gagged.
7. Karma below 700 will be banned.
8. Do not manipulate props in dangerous ways. (Unless you're a traitor.)
9. Do not idle / camp as a traitor. (see section VI)
10. Respect the admins and their decisions.
11. No Porn / R rated sprays.
12. Do not troll
13. Do not name yourself similar to another player on the server.
14. Do not have names that will be confused with radio commands (nobody / somebody in disguise / etc)
15. Detectives cannot make new rules, they must follow the rules listed here.
16. No Hate speech (Racism, sexism, etc)
Its not listed anywhere in the rules as it being against the rules. It doesn't stop the admin from doing their job, arguably, its makes it easier for them to do their jobs, because they can focus on observing players without having to worry about their own gameplay. Targetting specific people for something like knifing over and over again has never been a rule EVER enforced on TTT, and is not listed ANYWHERE.