Just your typical anti-American, anti-Semitic leftists.
Pfft. They wish. I used to be one of these people, and I can tell you that nine out of ten wouldn't know which end of Karl Marx to feed and which to diaper. Most of these kids are — as I was — bored, impressionable delayed adolescents, not political operatives. Oh, sure, they know all the slogans, and they listen to all the right music, but really they're just looking for three things: attention, something to do, and [obscene euphemism for sexual intercourse].
Need proof? Look at the babyfat little girl in the white top and jeans giving the international "woo" salute in #11. I knew (in every sense of the word) a hundred like her during my protestin' days: bored, cute, and a just a little bit spoiled, she's been spiritually sodomized by her PoliSci 101 TA's radical Marxism (plus he's super cute!) and she's looking to "make a difference" in the "real world" after growing up in some bland surburban desert. By participating in "an act of civil disobedience for social justice", she differentiates herself from the blond, tanned sorority sister goddesses she secretly envies, boosting her weak self-esteem and letting Mommy and Daddy know that I'm Not Your Little Girl Anymore (but please keep making the car payments). She also adds vital "street cred" to her dating profile, enabling her to dump the art-school bisexuals she's been dating (see the shivering human chihuahua standing next to her?) and get a slice of the gorgeous, long-haired Artiste types that inhabit the upper-level sociology and sculpture classes. (Alas, after feasting on her virgin USDA prime suburban mall-quality booty, they'll get her pregnant and dump her pre-graduation, but she doesn't know that.) By her senior year, she'll have had two (possibly three) abortions, an upside-down car note, and a useless B.A. in Anthropology. Later, she'll go back home to mom and dad, then marry a guy she met at Stuckey's while getting gas. He owns his own used car lot.
Anyway, I wouldn't pay too much attention to these "revolutionaries". That's what they want. I know -- I was one of them. Just let them have their tantrum and keep them from hurting people or property and eventually the Gods of the Copybook Headings will limp up to explain the facts of life to them in terms they can't deny. That's what happened to me. Power to the People! Right On!
The picture isn't clear but they seem to also be burning a small Israeli flag in the background.