As a Marxist theorist and representative of the leftist of The Second International and the Social Dy of the international communist movement. Although had been questioned in a long time, she agreed with Karl Marx and Friedrich Engels on the issue of freedom of the speech within the party. Unlike Lenin, however,Luxemburg actively fought for the freedom of speech before workers' party took power, but also advocated press freedom within and outside the party even after that, and strived to stick to the concept of “freedom is always and exclusively freedom for the one who thinks differently”.