Department of Special Investigation (DSI) chief Tarit Pengdith has threatened to take legal action against people who blow whistles at their political opponents.
The whistle-blowing campaign was initiated by ex-Democrat MP and anti-government protest leader Suthep Thaugsuban, who called on the protesters to blow whistles at cabinet ministers and "servants" of deposed former prime minister Thaksin Shinawatra.
Mr Suthep also named Mr Tarit as one of the targets.
Mr Tarit said three DSI officials and himself have been the victims of whistle-blowing since Mr Suthep announced the measure on Friday.
The officials were targeted at the Government Complex yesterday morning, Mr Tarit said.
He also encountered whistle-blowers at a shopping mall last weekend.
The act is deemed to incite hatred among people, which could turn violent, Mr Tarit said.
The DSI officials must record such acts and report them as quickly as possible, he said.
The actions violate Section 370 of the Criminal Code which states that if someone creates noise that is a nuisance to the public without a proper reason they will be fined up to 100 baht.
Section 397 states that if any person causes embarrassment or humiliation to others they will be liable to one month in jail or a 1,000 baht, or both, Mr Tarit said.
Civil servants who commit these offences will be reported to their agencies where they will be disciplined, he said.
"I am OK if they blow whistles at me, but ordinary DSI officials do not deserve it," said Mr Tarit.
Deputy Prime Minister Plodprasop Suraswadi was also greeted by whistle-blowers when he presided over the public hearing of a water management project in Phichit yesterday.
A group of amnesty bill protesters and water management project opponents blew their whistles at Mr Plodprasop when he arrived at the Pichit provincial sport stadium. The minister responded by blowing his own red whistle, triggering boos. Mr Plodprasop was escorted to the water management compound under police guard.
Mr Plodprasop said the whistle-blowing did not affect him, but claimed the protesters swore at him.
He also accused those who oppose the Bueng Si Fai water project of having politically motivated reasons.
Meanwhile, Interior Minister Jarupong Ruangsuwan yesterday confirmed a cabinet meeting will be held in the Democrat stronghold of Songkhla on Nov 29 and 30. Mr Jarupon said he had ordered all provincial governors to be wary of protesters taking part in the anti-government campaign in their provinces when cabinet ministers are scheduled to visit.