In which ways are Marx and Engels ideas relevant for sociology today?

Marxism became a way of interpreting the world. History is a struggle of antagonistic classes also influenced in art, education and literature. From generation to generation his political philosophy remains important, many seek his inspiration. There are still issues that Marx talked about such as globalization, inequality and the internationalization of markets. Marx claimed that the system would suffer periods of recurrent crises, what are now called recessions. He also affirmed that capital tends to concentrate on a few and this leads to unemployment and the depreciation of workers' wages, which is currently evident. Engels through his works allowed the emergence of trade unionist, communist and socialist movements around the world.