"I will show the Shiv Sena president what a surgical strike on black money means, when I release the list next week," he said referring to Uddhav Thackeray daring Prime Minister Narendra Modi to conduct "surgical strikes" on Swiss banks to bring back black money.
Thackeray had spoken of public inconvenience following the Centre's demonetisation move, saying it amounted to "torture" of people.
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"People have put immense faith in you (PM). Do not betray their trust or you will see the impact of peoples' surgical strike against you," he had said.
Somaiya told PTI that Mayawati, Mulayam and Uddhav Thackeray should clarify if they were worried about poor people or those with boxes of money.
"When I release the list, the 'Mumbai mafia' and the Congress and NCP will know where the black money is marked," he said.
The BJP MP has been using the term 'Mumbai mafia' over the last several days to denote alleged corruption by Shiv Sena in BrihanMumbai Municipal Corporation (BMC).
"Uddhav Thackeray will come to know where the Mumbai mafia money is parked, when I disclose the names of the companies concerned next week," Somaiya added.