Fundamentally dialectical materialism is concept of history, it struggle between social class. The productive capacity of society is the foundation of society, and as this capacity increases overtime the social relation of production, class relation, evolve through this struggle of the classes and pass through definite stages (primitive communism, slavery, feudalism, capitalism). These concepts always repeated until now.

Marx’s theory portrayed society like a league table. It means that society involves competition between social group/class. His theory explains that society must be class. Like high class, middle class and upper class.

In other side, capitalism also result of social class there are bourgeois and proletariat tend to exploitation. Bourgeois is (politic) or relating to the middle class. It supports the interest of capitalism, not communist. Mainly interested in possessions and social status. Proletarian is the class of workers who don’t own the means of production and who earn their living by working for wages Esp. in industry. We can see in Indonesia, many labors get not enough pay average with their work. Its ironic situation when they don’t receive pay because their factory was bankrupt. They like proletarian which just work to bourgeois them.

Capitalism also causing the class conflict, class alienated from each other.

The capitalist mode of production is distinguished by how the owners of capital extract this surplus from workers—all prior class societies had extracted surplus labor, but capitalism was new in doing so via the sale-value of produced commodities. Marx argues that a core requirement of a capitalist society is that a large portion of the population must not possess sources of self-sustenance that would allow them to be independent, and must instead be compelled, to survive, to sell their labor for a living wage. In conjunction with his criticism of capitalism was Marx's belief that exploited labor would be the driving force behind a revolution to a socialist-style economy. This cycle of the extraction of the surplus value by the owners of capital or the bourgeoisie becomes the basis of class struggle. This argument is intertwined with Marx's version of the labor theory of value asserting that labor is the source of all value, and thus of profit.

The effect of capitalism; capitalism causing many effect, one of them is dehumanization. The workers become a like machine. They must extra worker to bourgeois without extra time and minimum wages. This is problem also still happen in Indonesia especially, where some people become labor which minimum wage with extra job. For example, they must work from 07:00 am until 02:00 pm (following UMR) but its not if they are free labor (buruh serabutan). It causes labor strike in the world over. Exploitation is use or treats sb/sth in an unfair and selfish manner for ones own advantage or profit. Indonesia in the past, the labor also gets exploitation from colonist. Until now many worker from Indonesia which get job in own country and foreign also get exploitation from “bourgeois” them.

The reasons of labor strike are dissatisfaction with company policy, Salary and incentive problems, Increment not up to the mark, Wrongful discharge or dismissal of workmen, Withdrawal of any concession or privilege, Hours of work and rest intervals, Leaves with wages and holidays, Bonus, profit sharing, Provident fund and gratuity, Retrenchment of workmen and closure of establishment, Dispute connected with minimum wages. Its problem causes many labors in Indonesia often strike. However, Indonesian government was organize law/UU about labor and give day for labor.

The strength of Karl Marx’s theory are this theory base on class struggle which become history until whenever to keep relevant on contemporary society where customer not only between labor’s group and capitalist, but there are new class on customer. Marx’s theory also support in the long time or many era because it can be discussing about exploitation and alienation. It’s deliberately about this theory was appeared new theory like hegemony and feminism.

The weakness of Karl Marx’s theory is after many years, the labors can’t get a freedom (win) toward their right and the billionaire keep has more power. This problem can be explain that this theory show relation about reality which happen in society but in other side, also utopian because base it own assumption about power of instrument of production.