Who was the early economist argued against capitalism?

One of the early economists who argued against capitalism was Karl Marx. In his seminal works, particularly "The Communist Manifesto" and "Das Kapital," Marx critiqued the capitalist system for its focus on profit and exploitation of labor. He believed that capitalism inherently leads to class struggle and inequality, advocating for a classless society where the means of production are communally owned. Marx's ideas laid the groundwork for various socialist and communist movements that sought to challenge capitalist structures.