When MI5 label someone a subversive, is there any way to fight this legally?

I've been hared and ruined by them for 9 years now, all i did was set up a website claiming harold Wilson was removed from power by them, This is a democracy isn't it? but i've never been taken to court just placed under house arrest and escorted wherever i go but i am not allowed to clear my name. is it because i have upset the establishment and not the government and if people found out that other subversives were being treated without human rights there would be a public backlash? The british people pay for to british military to control them. This James Bond notion was the worst thing that could have happened because we think they are fighting for us and it turns out they are as likely to turn on us as people abroad.