The FBI isn't part of the "anti" crowd. Neither is the FEC.
maybe...
Certainly not officially, as officially, they must be neutral. However, I don't think anyone can say with any certainty that individuals within those agencies (and every other agency of govt) don't let their personal political persuasions influence their work.
Of course, that would be a violation of policy, and possibly law, but people are people and some of them will bend or break the law for what they believe is a good cause.
As to investigating the NRA and Russia, or a certain Russian, so what? It gets reported so the NRA LOOKS like they did something wrong (otherwise why investigate, right?), but investigation is not even remotely the same as bringing charges, or having proof. Until/unless sufficient evidence is found to bring charges, until then, investigation is NOTHING more than trying to find out what is, and isn't reality.
Remember that investigations are also used to clear someone of false charges, too...
They could investigate the waitress the Russian tipped when he got lunch. TO make sure she didn't illegally donate her tip money to Trump.....
Unless they file charges, it means nothing.
Banner headlines reporting the NRA is under investigation, while factual, are simply being used as a smear tactic, implying, and counting on the gullibility of people to believe that investigation = guilt.
Until the investigation is concluded, it means only that there is an investigation. NOTHING else.