We'd better not post articles concerning NAMBLA, PeTA, the KKK, the UN, or ELF, either... and I'd argue that Congress sometimes belongs in that bunch! =^)
IIRC, this group on their website had posted their strategy on how to "infiltrate and take over" Free Republic with their view of immigration.
So this was a little more serious than simply posting an occasional article from a fringe group.