 One of his most famous stories for the magazine was "Bankubabur Bandhu" ("Banku Babu's Friend" or "Mr. Banku's Friend"), a Bengali science fiction story he had written in 1962 and which gained popularity among Bengalis in the early 1960s.Ray also introduced his famous characters Feluda and Professor Shonku in short stories he wrote for "Sandesh".In 1963, when the magazine faced a financial crunch, Satyajit Ray formed a non-profit literary co-operative, Sukumar Sahitya Samavaya Samity Ltd., with some like-minded friends and relatives, and this co-operative has since been running the magazine.. Satyajit's aunt, the writer Leela Majumdar became the honorary joint editor of the magazine in place of Sri Subhas Mukhopadhyay.