The investigation was conducted jointly by the Lahav 433 National Economic Crime Unit and the Justice Ministry's insolvency enforcement unit.
Police detained a contractor and several other businesspeople for questioning on Monday on suspicion of concealing interests in real estate and transferring assets during bankruptcy proceedings, Israel Police said.
One of the figures questioned is considered close to senior Likud circles.
According to police, the contractor, who has been in bankruptcy proceedings since 2012, allegedly concealed his rights to properties worth tens of millions of shekels and transferred assets under his control, in violation of his obligation to disclose them.
Police said the suspects allegedly acted systematically to conceal their interests from authorities. Property was seized during the operation for possible forfeiture later in the legal proceedings.
The investigation was conducted jointly by the Lahav 433 National Economic Crime Unit and the Justice Ministry's insolvency enforcement unit.