I know he was chastised by the switchboards and/or for the deluge of emails that came in when he first put up his Immigration Reform Caucus site. He was told to remove links to stop the flood of responses he was receiving.
He still has VDARE up and other groups, so that's kind of interesting. I think I might try to get an answer again.
Center for Immigration Studies
Sierrans for U.S. Population Stabilization (SUSPS)
Numbers USA
C.C.I.R.
Project USA
V.D.A.R.E.
Federation for American Immigration Reform
Population Environment Balance
U.S.B.C.
Negative Population Growth
Carrying Capacity Network
Center for Comparative Immigration Studies
Colorado Alliance for Immigration Reform
Desert Invasion - U.S.
That's a rather interesting smorgasbord of interest groups.