Slowly, the station emptied; the coast was clear. Spinning on her heels, a mischievous glint in her soft blue eyes, she whipped a red wax crayon from her handbag and, wielding it sword-like, scrawled her fury across a billboard advertising home appliances.

"TOO MANY THINGS, NOT ENOUGH POETRY!" she wrote.

Pow! Thus another blow was struck in a fight raging in France against advertising. The attackers are a small, heterogeneous but determined band of campaigners for whom ads are a plague. Their battlegrounds are the tunnels and platforms of Paris' subway, and bus stops in other towns. Their targets: companies that make capitalism tick.

Organizing over the Internet, hunted by the forces of order, these urban guerrillas are focusing debate on advertising's power. Is there too much of it? Does it really work? Should we fight back?

For Suzanne, a 63-year-old political militant since she first threw stones at police during student riots that shook France in 1968, the answer to those questions is "Yes."

"Capitalism needs consumerism to survive," she said. "If we get rid of advertising, we get rid of consumerism and that will get rid of capitalism."

Mmmmmm. It's hard to envisage the foundations of the global economy toppling anytime soon. But the anti-advertising movement has provoked a counterattack from French advertising giant Publicis and Paris' public transportation operator, the RATP.

Joining forces, the two firms are taking 62 anti-ad militants to court on Wednesday, seeking $1.2 million in damages for destruction wreaked and scrawled on billboards.

Suzanne is not among those 62, but the threat of fines scares her enough she won't give her surname. Nevertheless, she campaigns on, riding the Metro with a band of like-minded teenagers one recent Saturday, trailing destruction in their wake.

Pssssshhhhhh. Louis, 16, worked quickly but efficiently with a can of black spray paint. "ADVERTISING NUMBS YOU" read his still-dripping slogan on a billboard for the movie "Shrek 2."

"Walt Disney. Hollywood. Big budget. No good," he muttered by way of explanation before sprinting down the platform to attack another billboard before a train pulled in.

"It's joy," he said, describing how it felt to spray. "It's a real pleasure to finally be able to resist."

France's anti-advertising campaign to some extent dovetails with a larger movement against globalization that regularly protests meetings of the World Trade Organization, the Group of Eight industrial nations and other "capitalist" bodies.

One of Suzanne's band, Christophe, 17, said he traveled to the Alps last June to protest a G8 summit.

Suzanne's group changed subway lines every three or four stations to avoid being spotted by security agents. At each station, they first followed other passengers heading toward the exits. Then, having determined no guards were lurking in the tunnels, they doubled back to set to work spraying and tearing down ads.

It was not possible to determine how many such groups were in action that Saturday. But Suzanne's band stumbled across another group slapping homemade stickers marked, "The struggle against ads continues" on billboards at one station.

"Advertising is a one-way message that amounts to harassment," said Nicolas, a teacher in his 30s who was part of the second group. "We should have the right to refuse it."

By evening's end, Suzanne's group had wrecked more than 50 advertisements in at least eight stations. Other groups attacked dozens of others. "Every day I wash my brain with advertising," read one sticker, mocking washing powder ads.

The RATP, which transports millions of Parisians each day, is not happy to find itself on the front line. It believes Paris' public is on its side, citing a survey it commissioned last month in which 73 percent of 800 people questioned said advertisements make their public transport journeys "more agreeable and less monotonous" and 75 percent said they disapproved of the anti-ad militants.

"These people are on the wrong side of the law. We can't let this type of action go unchallenged," said RATP spokesman Fabien Contino.

The RATP says the $74 million to $86 million it earns each year from selling advertising space could buy 300 new buses. Contino said ticket prices would rise by 5 percent if there were no ad, an increase equal to just seven cents.

But in a small victory for the campaigners, the RATP on Monday and for the next 10 days was to free up space on 47 billboards in 24 stations for people to write what they like. The firm's apparent hope is to channel anti-advertising anger, sparing paid-for billboards.