Unions are very beneficial under democratic representative governance of capitalism (they help check and balance collective capital, via collective labor) and breaking labor unions while allowing capital collectives is a sure sign of authoritarian misrule. Marxism is a socio-economic theory that works fine - everybody who discusses economics takes basic principles and insights from it for granted as useful and enlightening. Evaluating political and economic systems by the common criteria of Marxist analysis - such as "From each according to their ability, to each according to their need" - is now just using common sense. Imagine an analysis that claimed a socioeconomic system that did not reward and employ most people's abilities or provide for most people's basic needs was a successful and good one - a joke, right? Before Karl Marx and Adam Smith such analyses were common. They were used to defend theocracies and monarchies and horrorshows like the American plantation slave economies. Such as right now, when a fascist movement is trying to take over the governance of the United States of America. History shows us that if you don't actively stop a fascist movement you and your children will be living under it - and it will not be benevolent. If a system is racist and abusive of many citizens, built on lies and bribes, it should be destabilized - and it will be, eventually, by fair means or foul. That's what a representative and democratic system is designed to do by fair means, without revolution and violent lawlessness - it's one of the great advantages of representative and democratic government. But it requires adult citizens's continual watchfulness and participation and attentive care.