Several London-based feminist and lesbian groups on Wednesday protested a policy forum on the topic of transgender rights, claiming women’s rights are imperiled by the movement.

Women and Girls Equality Network, Transgender Trend, UK Lesbian Rights Group, and Parents Campaigning for Sex Equality for Children were among the groups picketing the Westminster Social Policy Forum on Transgender Rights, reported feminist blog Gender Trender.

Protesters held up signs such as “Keep Trans Out of Women’s Sports” and “Silenced No More” outside of the Congress Centre in London.

The feminist and lesbian groups were outraged at the 2015 Parliamentary Women and Equalities Committee Report — which advocated removal of sex-based, anti-discrimination measures in favor of those based on “gender identity.” The transgender rights forum on Wednesday was organized by many of the same people behind the committee report.

If the committee’s recommendations are adopted, women would have no legal redress when their rights are violated by the inclusion of transgender males in women’s spaces, such as locker rooms, restrooms and jail cells. Females and transgender males would be considered part of the same group — “women” — under the law.

“This would give men who proclaim such gender feelings the legal right to expose themselves in women’s locker rooms and other single-sex facilities where public nudity occurs and where women are particularly vulnerable,” Gender Trender said. “Convicted male prisoners who proclaim gender feelings will be housed in cells with convicted female prisoners who will have no legal grounds to object.”

The report was spearheaded by Committee Chairwoman MP Maria Miller, a member of the Conservative Party.

​The U.K. protest comes as the United States is locked in a similar battle over how to accommodate those who identify as the opposite sex.

North Carolina passed a law earlier this year regulating public facilities on the basis of biological sex, sparking a national backlash and boycott effort against the state.

The U.S. Department of Justice and North Carolina sued each other, and President Obama issued an edict compelling public schools nationwide to permit bathroom and locker room access on the basis of “gender identity.”​