C ome hear a talkback to a PowerPoint of a cassette tape of an essay by Bob Avakian! Would you like to attend a screening of a Betamax of a Super 8 of a lecture by Bob Avakian? Maybe you’ve seen the volunteers in their black T-shirts, handing out Revolution newspaper outside left conferences and protests. Or perhaps you’ve seen the posters, the sandwich boards, the flyers with their gummed-up tape. You can find them near wherever Revolution Books are sold, which happens to be exactly two places, three thousand miles apart, one where I grew up and one where I live now. I pass Revolution Books in Berkeley almost every day on my way to work, and every time I do — skimming these advertisements for new presentations in obsolete media, their degraded quality a sign of purported integrity — I strain to forget that I used to sit at the other Revolution Books, in New York, many hours a week.…