Which agency insured blank deposits?

In USA - FDIC does it. FDIC stands for Federal Deposit Insurance Corporation. The purpose of this is to provide "Deposit Insurance" which guarantees the safety of cash deposited in its member banks, currently up to US $ 250,000 per depositor per bank. Currently FDIC insures deposits at more than 7500 institutions in the USA. This is to ensure that customers do not lose out their hard earned money in case of bank failures or bankruptcy.

In India - RBI does it. RBI stands for Reserve Bank of India. They insure deposits worth 1 lakh from every customer per bank.