He was once a Naxalite, now teaches students for free

"I was into active politics between 1968-1971 when I was teaching at Basirhat College," Kundu told The Telegraph.

The Naxalite movement helped him be "infused with the spirit to serve," hence, upon release from the Dum Dum correctional center in 1974, he "decided to pursue a mission not through the path of armed revolution, but by spreading science education among the poor."

Today, the institute has six rooms, including two classrooms, stocked with books and laboratory equipment; some purchased and many donated over the years.

Kundu, who used to teach at the Basirhat High School, previously relied on his pension to fund the tuition classes.

But over the years, donations from former students and benefactors have helped sustain the Institute, for which, Kundu also took loans.

"If you're from Basirhat and don't know where the Institute of Physics is located," Basirhat-resident Sayan Ganguly told The Better India, "then it's a matter of shame."

Further, an ex-student said, "He has earned the respect of people of this entire belt for his dedication."

Kundu, who suffered partial paralysis a decade ago, still holds exhibitions and quizzes across the district to promote education.

Speaking about why he distanced himself from the Naxalite movement, Kundu told The Tribune in a separate interview, "The leaders of the movement made several errors as a result of which it was discredited and, ultimately, rejected," adding that unilateralism became the movement's bane.

Kundu believes that people should instead demand accountability from the State over failures such as poverty and inequality.