Mumbai, Dec. 16 -- The restrictions imposed by the Reserve Bank of India (RBI) on Punjab and Maharashtra Co-operative (PMC) Bank on September 23 have pushed several housing societies in the city on the brink of a financial crisis. The central bank had capped the withdrawals from PMC Bank to Rs.50,000 for six months, after a fraud worth Rs.4,855 crore, in which several of the bank's executives are allegedly involved, came to light in September....