A symposium that was to be in support of Iranian and Afghan women has now been put off after organizers apparently received threats from transgender activists for inviting a woman who believes that sex is wholly determined by biology.

The Times reported that the Comité Laïcité République (CLR), translated as the republic secularism committee, an association meant to promote French secularism, has said trans activists had threatened to crash the event with “rotten eggs and baseball bats” after learning that Marguerite Stern would be there. Stern has spearheaded a nationwide effort to denounce the “murder of women by their husbands and partners,” per the report.

Stern took to Twitter concerning the debacle, saying: “I receive threats because I say that women are females. That’s the world we’re living in. I was first cancelled from the conference, and then it was postponed and I was re-invited.”