Sources said detailed dossiers are being prepared on several "suspicious" people connected to the defence sector.
The first to face the heat was defence consultant Sanjay Bhandari who was raided by the Income Tax department after being under surveillance, they said.
Certain documents seized from his possession led various agencies to a number of individuals who were subsequently put under the scanner, the sources said.
His call data records have revealed that he was in touch with a lot of other such "consultants", foreign companies and influential people.
While sifting through the documents, the agencies stumbled upon his links with another consultant who is very active in the aviation industry.
He too was searched by the Income Tax department soon after, but in connection with another case, and the effort now is to build data of common contacts in politics and bureaucracy, the sources said.
Choudhrie was investigated in 2004 by CBI over suspicions related to alleged pay-offs to him by a Russian company and UK firm Rolls Royce.
He has been on the radar of agencies for many years even though the CBI probe against him in two separate cases was closed.
Besides the central security agencies, other agencies keeping a tab on such consultants are the Income Tax department and the Enforcement Directorate.
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