Tens of thousands filled the streets of Madrid Saturday to demand lawmakers reject a proposed bill that would drastically limit abortion rights to cases of rape and extreme physical danger only.

Banners declared "Because I decide" and "It's my right, it's my life" as the massive crowd marched to Parliament in the largest protest since Spain's ruling conservative government backed the anti-choice legislation in December.

People from across Spain joined in the demonstration, which was organized by dozens of women's rights, feminist, and reproductive justice groups. Numbered among the protesters was a "freedom train" of at least 100 people who had traveled from Gijon in the north.

Many of the bill's opponents warn it threatens to set back the clock on women's rights to the era of fascist rule under dictator Francisco Franco.

"I came because I think this takes our country back many years regarding women's rights, criminalizing something that shouldn't be a crime," said Ana Alonso, who was demonstrating in Madrid, according to the BBC.

"We overcame this a long time ago and we have a right to have abortion performed under proper conditions without risking women's lives and their health."

Meanwhile, thousands rallied at the Spanish Embassy in Paris — wielding knitting needles to illustrate the dangerous, clandestine abortions they say many in Spain will be driven to if the anti-choice legislation passes. At least 100 people marched in London to show solidarity, many of them waving coat-hangers.

The draft legislation would, if passed, limit abortion rights to incidents of rape or serious health risk to the pregnant person, force those under age 18 to get their parents' consent, and impose more stringent conditions for aborting a fetus due to malformation.

Approved by Prime Minister Mariano Rajoy's cabinet in December, the bill is believed to be an attempt to mollify the right-wing of the ruling conservative People's Party. The attempt to curb abortin rights comes just four years after the country legalized abortion on demand within the first 14 weeks of pregnancy.

The draft legislation comes despite polling that shows 80 percent of people in Spain, including practicing Catholics, support access to abortion on demand.

Begona Pinero, who is involved in a feminist group that organized the "freedom trains," told AFP that she journeyed to Madrid "to tell conservative (Justice) Minister Alberto Ruiz-Gallardon that we don't want him to change the law."

She added, "We the women are free and we are capable of deciding when we want to become a mother."

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