Mr. Robertson, a 1988 Republican Presidential contender, included in the letter a plea that money be sent to the organization Stop E.R.A. to "help defeat E.R.A. and defend the family in Iowa."

Betty Durden, head of the group Iowa Equal Rights Amendment 1992, said Mr. Robertson's letter was "ridiculous."

But Ione Dilley, a member of Stop E.R.A. and chairwoman of the Iowa Christian Coalition, said that although she would not defend Mr. Robertson's references to child-killing and witchcraft, he was correct about hidden agendas.

She said her proof came from a hearing called by state officials seeking opinions on how the amendment should be summarized on the Iowa ballot. She said the meeting had been attended by officials for the National Organization for Women, Planned Parenthood and "the homosexuals."

"If this resolution to change our Constitution were not vital to them," Mrs. Dilley said, "why would they show up at this hearing?"