What political idea wants to unite the workers of the world?

The political idea that seeks to unite the workers of the world is known as socialism or communism, primarily articulated by Karl Marx and Friedrich Engels. This ideology advocates for the collective ownership of the means of production and aims to eliminate class distinctions, asserting that workers across all nations share common interests and struggles. The famous rallying cry "Workers of the world, unite!" encapsulates the goal of fostering international solidarity among the working class to challenge capitalist systems.