SEAFORD, New York (Reuters) - For years, New York's Long Island Roller Rebels have welcomed transgender women to strap on skates and body padding and join their women's roller derby team.

Now, under an executive order issued this month by Nassau County on Long Island, if they want to book a county-run park or athletics facility they must ask each member what sex was marked on their original birth certificate, and expel any teammates who were not designated female.