The Wall Street Journal wrote an article on Congressional ties to fringe groups like these. Here's what the WSJ wrote about John Tanton. This came from an original FR thread dated June 17, 2004.
"During a immigration subcommittee hearing in March, Mr. Cannon had the gumption to question the executive director of CIS, Mark Krikorian, as well as to challenge Roy Beck, who heads NumbersUSA and serves as "spokesman" for CFAW. After first denying it, Mr. Krikorian was forced to admit that CIS is a spin-off of FAIR. In fact, CIS, FAIR, NumbersUSA, Project-USA -- and more than a half-dozen similar groups that Republicans have become disturbingly comfy with -- were founded or funded (or both) by John Tanton, a retired doctor in Michigan. In addition to trying to stop immigration to the U.S., appropriate population-control measures for Dr. Tanton and his network include promoting China's one-child policy, sterilizing Third World women and wider use of RU-486. FAIR, where Mr. Krikorian once worked, is run by Dan Stein and shares advisers and personnel with CIS and other members of the Tanton nexus. As our Jason Riley noted in a March 15 op-ed, "By Dr. Tanton's own reckoning, FAIR has received more than $1.5 million from the Pioneer Fund, a white-supremacist outfit devoted to racial purity through eugenics." Representative Cannon says, "Tanton set up groups like CIS and FAIR to take an analytical approach to immigration from a Republican point of view so that they can give cover to Republicans who oppose immigration for other reasons."