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LOS ANGELES – Protesters rallied in dozens of cities Saturday as part of a global protest against seed giant Monsanto and the genetically modified food it produces, organizers said.

Organizers said “March Against Monsanto” protests were held in 52 countries and 436 cities, including Los Angeles where demonstrators waved signs that read “Real Food 4 Real People” and “Label GMOs, It’s Our Right to Know.”

Genetically modified plants are grown from seeds that are engineered to resist insecticides and herbicides, add nutritional benefits or otherwise improve crop yields and increase the global food supply.

Most corn, soybean and cotton crops grown in the United States today have been genetically modified. But critics say genetically modified organisms can lead to serious health conditions and harm the environment. The use of GMOs has been a growing issue of contention in recent years, with health advocates pushing for mandatory labeling of genetically modified products even though the federal government and many scientists say the technology is safe.

The `March Against Monsanto’ movement began just a few months ago, when founder and organizer Tami Canal created a Facebook page on Feb. 28 calling for a rally against the company’s practices.

“If I had gotten 3,000 people to join me, I would have considered that a success,” she said Saturday. Instead, she said an “incredible” number of people responded to her message and turned out to rally.

“It was empowering and inspiring to see so many people, from different walks of life, put aside their differences and come together today,” Canal said. The group plans to harness the success of the event to continue its anti-GMO cause.

“We will continue until Monsanto complies with consumer demand. They are poisoning our children, poisoning our planet,” she said. “If we don’t act, who’s going to?”

Protesters in Buenos Aires and other cities in Argentina, where Monsanto’s genetically modified soy and grains now command nearly 100 percent of the market, and the company’s Roundup-Ready chemicals are sprayed throughout the year on fields where cows once grazed. They carried signs saying “Monsanto-Get out of Latin America”