Violent class warfare, how progressive.

(NYP) — Some 50 Occupy Wall Street protesters saw red yesterday — giving an enthusiastic welcome to a genuine communist.

Alex Callinicos, a professor of European Studies at Kings College in London, announced to his rapt audience, “I am a Marxist.’’

Asked if the upcoming revolution can be non-violent, he parroted the party line of the demonstrators, who call themselves the 99 percent of Americans lined up against the “1 percent’’ with power and money.

He said violence could be avoided only if the “1 percent accept the decisions of the 99 percent,’’ which he predicted would never happen.

While he was speaking about the revolution, most of the demonstrators in Zuccotti Park were making plans for a long, cold winter.

“It’s been dumping snow here in NYC. . . high winds and 3 inches of slush on the ground. . . [and] those occupying Liberty Plaza [Zuccotti’s former name]. . . are in need of emergency supplies crucial for cold-weather survival,” organizers said on their Web site.

Their elaborate wish list included “insulated gloves, wool hats, scarves, long underwear/smart wool thermal socks, all-weather sub-thermal sleeping bags [and] all-weather tents.”

And sympathetic supporters were quick to deliver.

“I was feeling really bad for them yesterday,” said Beth Kelley, 47, an ex-Wall Street worker who brought fleece hats and scarves.

But not everyone felt sorry for the soggy masses.

Nick Hommen, 29, a volunteer from Salem, Ore., who was handling donations, said some demonstrators were taking advantage of people’s generosity.

“We can’t afford to keep buying new tents. It’s ridiculous the sense of entitlement people feel,” Hommen said.