In this context, it's a bot account whose display name or banner has the name of a particular networked harassment site whose initials are K.F. in it, causing people who see the account to potentially believe the site is personally watching or targeting them for further harassment. -LF
An account of a collection of... Individuals, who were either banned from 4chan for being too much, or voluntarily left because 4chan didn't go far enough.
Comments
Place starting with F where plants and animals are managed.
It's a hategroup, who's targeting a variety of minorities. You can google the rest.