A couple of points.
Saul Alinksy was a Chicago Marxist/socialist/statist etc. who wrote the very influential book (I had to read it in college) Rules for Radicals. It is safe to say that pretty much every solid lefty activist/politician in the game today has read the the book or is at least familiar with it. Former president Obama it is said was steeped in Alinskyite philosophy while he was a “community organizer.”
If one is not a lefty activist/politician one would also be wise to learn its lessons too however.