In my tenure on various paranormal boards and forums, there was one mention of a collection of rare or suppressed books written by an individual named Undervick Moskedovarko. One of the titles of which being "On Chaos." Supposedly these were banned by the Russian government for being too politically subversive but also for other, less political reasons. Some suggested they contained truths that were meant to be hidden, that humanity as a whole wasn't ready to contend with.
Strangely enough, it seems "On Chaos" is actually available to read online. But it's in Portuguese. Any anons know it, and could comb through it to see if it's got any merit/validity?