New Delhi, Sept. 18 -- The Reserve Bank of India (RBI) recently said it has revoked the licences of 31 non-bank financial companies (NBFCs), including two little-known Kolkata-based firms linked to fugitive liquor baron and Kingfisher Airlines founder Vijay Mallya.

These two companies are Kamsco Industries and Pharma Trading Co., which are registered at the same Kolkata address and once held stakes in United Breweries-a company long associated with Mallya.

Mint takes a look at these companies and what their businesses are all about.

While the central bank doesn't specify reasons case by case, it has broad powers under Section 45-IA(6) of the RBI Act to cancel NBFC licences. These include instances where a company has stopped conducting...