It's not just a Marxist thing,
Fear, Guilt & Shame are the currency of enslavement. They are what are used to make good strong men into servants and keep servants from breaking free.
No where is that more evident than in this whole "Social" garbage that our society has become... sure you have free speech, but if you say anything not part of the politically correct agenda for that day, they pile on Shame to get you to feel Guilt and comply, which then brings on the Fear of ever stepping out of the narrow path of ideology. Then of course they have to "kill" as in banning and shunning anyone they can't control as they can't have people speaking the truth without fear, or just plain speaking without fear.
They are doing it now here in the USA in the "Social" scene using big companies, Too many idiots blather on about "Corporate free speech...." to cover for Hard Leftists SJW Marxist Globalist, Sociopathic Technocrats using their companies to force their own ideas on people.
Watch out, before long it will be like Western Europe where you literally can be arrested for posting things that somebody feels are not flattering about whatever "special" type of snowflake group they are. Where the police make record numbers of arrests for "thought crimes" but say they don't have the manpower to stop robbery, rape and assault. Where if you post something disparaging (even if true) about certain "protected" immigrants, you can be arrested... yet those same "immigrants" are firebombing Jewish centers & openly preaching hate.
If not actually legally arrested, for saying dissenting views, you could be "virtually blacklisted" as the fewer and fewer big companies, all run by the same types of people start saying do what we say, or you don't exist. Your phone stops being able to access e-mail and messaging services, your e-mail accounts and online accounts suddenly get blocked.
If you want to see how it can get, try watching the 4 seasons of Black Mirror on Netflix.