I vaguely remember some incident back in early '00 when they found some "interesting" patch in FreeS/WAN code added by someone who was either consulting or tied

I vaguely remember some incident back in early '00 when they found some "interesting" patch in FreeS/WAN code added by someone who was either consulting or tied otherwise with NSA. There was a flurry of discussion on a mailing list followed, I think, by the patch reversal. Does anyone know what I am referring to?