Of whom do we speak? That would be the "99%."  This should not come as a surprise to you; most of the 60's protesters were of the same demographic. So the 99% percent was predominatly spoiled rich kids or aging hippies trying to recapture their youth. Color me surprised: NOT. 

Here's the money paragraph, literally and figuratively:

The study found that “white respondents were also significantly more likely to be ‘actively involved’ than people of color” in the movement. The protests were largely organized by a core group of experienced activists who were “disproportionately white and male,” according to the researchers. One interviewee involved in training sessions described the leaders as “a predominantly young white male group.” Another said they were “more privileged and more college-educated, and sometimes beyond college-educated.”

"Experienced activists." Translation:professional protesters.