Namely, this was in the page for Desiree Washington, the woman that Mike Tyson was convicted of raping.
In the section about the rape accusation, trial and conviction of Mike Tyson, I added information about a previous false allegation made by Ms. Washington against a high school friend.
Someone reverted my change with a cryptic comment about "BLP". I saw it a few days later and re-created my change. Again, my change was reverted with more comments about "BLP".
This was several years ago so I don't remember exactly what was said back and forth but the gist of it is that the other party thought that there was something in the wikipedia rules about the "Biographies of Living Persons" that prevented me from including the information about the false rape allegations Desiree Washington made in the past. I challenged the person to show specifically where BLP precluded me from including this information, they could not so I restored my change.
Apparently this other editor had wikipedia political connections because I received a "Warning" for making my edits. I was willing to be banned over this because for me it's about the principle of the thing. If wikipedia is a free encyclopedia that anyone can edit, I was going to make sure that this factual information was included. Hell, I can generate throw-away email addresses and wikipedia accounts. I'm not sure who resolved this but what happened in the end was that Desiree Washington's page went away and the information about the false rape allegations in her past were included on Mike Tyson's page.
After this, I stopped editing articles. I realized that situations like this are precisely why wikipedia isn't considered an authoritative source in the academic sense. People with more knowledge about a subject and with the supporting documentation can lose edit wars if the ignoramus on the other side has the political clout to have them blocked.