"As I note in the concluding paragraphs of this biography, it is routine in the United States to announce that the real and imagined flaws of the socialist bloc have invalidated the very idea of socialism for all time. Yet despite the intimate tie between the enslavement of our ancestors and the rise of capitalism, there are few—even in our community—who have the gumption to announce that this horrendous tragedy invalidates the very idea of capitalism for all time."
That's Gerald Horne during an interview about his new book about Paul Robeson, the spectacularly talented singer, actor, Communist and Internationalist. It was conducted by Keisha Blaine who tried to get at what Horne thinks Robeson can teach the Left today, and according to Horne it was the globetrotting Robeson's emphasis on Internationalism, which he says Leftists of today by and large ignore.
Capitalists, of course, know about Internationalism. When they do it we call it Globalism, and under its guise Neoliberal governments worldwide have cleared the way with laws and treaties to make it easy for capital to move across borders. To compete, to stop capital from constantly pitting one set of workers against another in it's never ending search for cheaper and cheaper labor, labor organizing and organizing on the basis of class has to be international, too.
By the way I'm familiar with Horne from his being a guest on Glenn Ford's Black Agenda Report several times to talk about one or another of his many books. The University of Houston professor is one radical academic, historian and thinker I recommend paying attention to. One thing he has done is remove the mask from the founding of the United States and shown with Marxist economic and historical analysis that rather than the great leap forward for humankind we think it to be it's a particularly unsavory form of Capitalist Imperialism that wouldn't even have been possible without the enslavement of millions of Africans and the genocide of the American Indian.