Abortion rights supporters began gathering for protests across the United States on Saturday, starting what organizers said would be “a summer of rage” if the U.S. Supreme Court overturns the Roe v. Wade case that legalized abortion nationwide.

Planned Parenthood, Women’s March and other abortion rights groups organized more than 400 “Bans Off Our Bodies” marches for Saturday, with the largest turnouts expected in New York City, Washington, Los Angeles and Chicago.

The demonstrations are in response to the May 2 leak of a draft opinion showing the court’s conservative majority ready to reverse the 1973 landmark decision that established a federal