Kazi Nazrul Islam was a leading nationalist poet, explain.

Hint: Intellectuals praise him for emancipating Bengali poems and publications from its medieval structure. His emotional nationalistic stance against the oppressiveness of British law often fetched him jail time. He composed short stories, novels, and documents but is renowned for his poems, in which he commenced new aspects such as Bengali ghazals. Nazrul inscribed and invented music for his almost 3000 songs which are altogether known as Nazrul Sangeet and widely prominent today.

Complete answer:
We have to remember that the Kazi Nazrul Islam is officially acknowledged as the national poet of Bangladesh and was also a celebrated poet in India.
He is conventionally perceived as the Bidrohi Kobi Rebel Poet as his miscellaneous works showcase a violent coup against coercion of humans through serfdom, resentment and ritual. His verse, with its energetic momenta and nonconformist themes, establishes a remarkable disparity to Rabindranath Tagore’s poetry. Nazrul availed themes and vocabulary never used in Bangla poetry before. He evolved incredibly outstandingly for depicting in his poems modern political and social experiences. Two of his greatly distinguished mutinous writings are 'Vidrohi' and 'Bhabgar Gan'.
At the end of 1921 Nazrul formulated another well-known poem: 'Kamal Pasha'. Among Nazrul's scholarly endeavours disseminated in 1922 .The most significant were Byathar Dan, Agni-vina, and Yugavani. Agni-vina that included Pralayollas, Shat-il-Arab, Vidrohi Agamani, Kheya-parer Tarani, and Kamal Pasha generated a commotion in Bangla literature and confirmed to be a whirling reason in Bangla poetry. Its early edition was sold out shortly after publication, and various versions in sudden progression had to be issued.

Note:We have to know that he was a Bengali poet, instrumentalist, extremist and philosopher who is competently known for initiating works of Bengali poetry.
He thrashed the British Raj and exhorted rebellion through his poetic works, like "Bidrohi” and "Bhangar Gaan" as well as his edition "Dhumketu." While in the cell, Nazrul composed the "Rajmandir Jobanbondi", amplifying his critique of imperialism. Nazrul denounced Muslim religious fundamentalism and investigated the vitalities of oppressed crowds in India.