Read the testimony of Bella Dodd before Congress. Do some basic research. It is frightening, but worthwhile.
I'm familiar with Bella Dodd's testimony, and there is no doubt that the Marxists have their very dangerous global domination agenda.
But given that power-hungry humans despise sharing their thrones, isn't it more likely that Marx, Gramsci and Engels were just good at predicting the demise of Western Society?
One can argue that the decline in society actually began in the 1790's with the French Revolution and the demand for "equal representation". Both Marx and Bastiat made similar observations, in the mid-nineteenth century, based on the changes that had occured in the previous fifty years; but where Bastiat argued in favor of the preservation of fundamental freedoms, Marx chose to embrace the decline of liberty and propose a use for it that would allow a select group to rise to power.
Based on this information, the Gramscians are no different than followers of Nostradamus.