Q. Who served as the editor of the Socialist weekly 'Sadhana' from 1956 to 1982?
Answer: Yadunath Dattatray Thatte
Notes: Yadunath Dattatray Thatte, a prominent Marathi journalist and socialist leader from Maharashtra, edited the Socialist weekly Sadhana from 1956 to 1982. He was also a notable freedom fighter, Rashtra Seva Dal activist, and authored biographies of renowned scientists.