John Rousselot (R-Cal.), John Schmitz (R-Cal.), who was the AIP candidate against Nixon in '72, and John R. Rarick (D-La.) Interewsting that they were all named John.
I think Congressman James B. Utt was another member of the John Birch Society, despite not being named John.
Congressman Larry McDonald, a conservative Democrat from Georgia, was an official in the John Birch Society. He was killed on the Korean airliner that was shot down by the Soviets.