At the U.S. Supreme Court, statehouses and other sites across the nation, abortion rights supporters held rallies Tuesday in opposition to the wave of sweeping abortion bans being enacted this year in Midwestern and Southern states.

Organizers – including Planned Parenthood, NARAL Pro-Choice America and the American Civil Liberties Union – predicted tens of thousands of people would attend hundreds of events scheduled in all 50 states.

The “National Day of Action to Stop the Bans” came in response to a near-total ban on abortion recently signed into law in Alabama, as well as bills enacted or nearing passage in Mississippi , Kentucky , Ohio , Georgia and Louisiana aimed at banning abortion once a fetal heartbeat is detected. That can happen in the sixth week of pregnancy, before many women know they’re pregnant. Missouri lawmakers have passed an eight-week ban.

None of the laws has taken effect, and all will likely be blocked while legal challenges play out. Ban supporters hope one or more of the measures might reach the Supreme Court and possibly trigger a reversal of the 1973 Roe v. Wade decision that legalized abortion nationwide.

In Washington, a demonstration outside the Supreme Court drew hundreds of protesters and several Democratic presidential candidates. Sens. Cory Booker of New Jersey, Kirsten Gillibrand of New York, Bernie Sanders of Vermont and Amy Klobuchar of Minnesota, in addition to Reps. Eric Swalwell of California and Tim Ryan of Ohio, were among the attendees as multiple members of Congress spoke to a crowd that hoisted signs defending abortion rights.

“I cannot tell you how important this moment in our country’s history is,” Gillibrand said. “Do not allow this moment to lapse without putting everything you can behind it. Organize, advocate and vote.”

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Some protesters carried purple signs that declared, “Abortion is a human right.” Among their chants: “No church/No state/Women must decide their fate.”

Lauri Ploch, 67, came from Alexandria, Virginia, with a sign depicting a drawing of a uterus and the message, “Mine, not yours.”

Ploch recalled the conflict over birth control and abortion rights in her youth, and suggested that her generation mistakenly believed that such struggles were in the past.

“I got complacent for a little while. I think a lot of people did,” she said. “Right now we need to really get up in their faces and show that we are ready to fight to keep our rights.”

In Atlanta, several hundred protesters jammed onto the steps of the Georgia statehouse.

Chants of “Vote them out!” and “My body, my right!” blared through a loudspeaker as passing drivers honked their horns in support. One woman carried a coat hanger with a sign that read, “Not going back.”

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Brandi Borgwat, 42, drove about 30 minutes from her home in Woodstock, Georgia, to join the protests.

“I didn’t protest before because it sounded so insane that I didn’t believe it would pass,” Borgwat said of Georgia’s new law. It’s scheduled to take effect on Jan. 1, but opponents have vowed to sue to block it.

In St. Louis, several hundred protesters gathered in a park between the Gateway Arch and the historic courthouse where the Dred Scott case decision that deemed black slaves as property, not citizens, was heard.

Katie Lorentz, a 19-year-old college student, said she worries that if she ever needs an abortion she’ll be criminalized.

“It puts a lot of women in danger,” Lorentz said of the new law. “States with strong anti-abortion laws have higher women mortality rates and infant mortality rates.”

Ashley Buck, 30, a waitress from St. Louis, held a cardboard sign that read, “I’m a Pro-Choice Mom” on one side and “Ask Me About My 2 Abortions – I Am Not Ashamed” on the other. She said she had one at age 16, and another at age 27.

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“My choice,” Buck said.

That same message was echoed by several hundred people gathered in the Utah State Capitol Rotunda. Their chant: “My body, my choice!”

Utah legislators recently passed a ban on abortions after 18 weeks but have agreed not to enforce the ban as a court challenge plays out.

In the crowd of abortion rights activists, one counterprotester, Deanna Holland, stood with an anti-abortion sign urging people to care for unborn fetuses.