After the failed Easter Rebellion in Ireland in 1916, Lenin took the idea even further, realizing that nationalism, which fools like this auto-newbie here reflexively label "right wing", can be used as a tool for inspiring the passions to move the mass to revolution, and was not contradictory to the overall agenda of Social Democracy if national equality was reached.
The mistake many people make is to think of Marxism as a staid, unchanging theory. It has continued to develop, long since the death of Marx and Engels. There are various flavors and versions of it.
And it tends to hide. After all, everyone knows communists are atheists. Except now they are realizing that radical Islam can be quite useful...
Amen to that!!