BJP also cited examples of snooping on former Prime Minister Indira Gandhi's daughter-in-law and on former Finance Minister when chewing gum was found in his office.
"The BJP today is definitely taking a stand that this is really surprising and shocking. Already on the dimension of snooping, research that has come out, I certainly feel that till 2010-11 snooping has become a part of Congress' DNA...We express our concern," BJP leader and Union Minister Nirmala Sitharaman said.
"The party (Congress) snooped then on Subhash Chandra Bose's family and continued during Indira Gandhi's regime when her daughter-in-law was also snooped at and the Finance Minister of the country was also subject to snooping, about which we do not know what came out," the BJP Minister said.
Sitharaman said even when the government was unaware of the whereabouts of Subhash Chandra Bose and did not even know whether he was alive or not, the government of the time continued snooping on his family till 1968.
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"It was very clear. There was a Commission established and headed by a retired judge and the victim herself had said there was no snooping on her," she said.
Intelligence Bureau kept relatives of Subhas Chandra Bose under close surveillance for two decades, most of which was during Jawaharlal Nehru's tenure as Prime Minister, according to archival material, triggerring a political controversy.
Bose's family reacted to reports with "shock" and said it was a "poor reflection" on the quality of democracy at that time.
Congress howeever debunked such reports about snooping on Netaji's family by the then government.