An essential group or core of working-class individuals who advocate for radical change or revolution in society.

क्रांतिकारी सर्वहारा केंद्र

English Usage: The revolutionary proletarian nucleus played a crucial role in organizing the labor strikes.

Hindi Usage: क्रांतिकारी सर्वहारा केंद्र ने श्रम हड़तालों के आयोजन में महत्वपूर्ण भूमिका निभाई।