Irregularities have been detected in the recruitment of forest department personnel during turncoat minister Rajib Banerjee’s tenure, Bengal Chief Minister Mamata Banerjee alleged on Wednesday, without naming him.

Banerjee, who was a forest minister in the state cabinet, had quit Mamata’s party last week to join BJP.

The TMC supremo, training her guns at all deserters, said they would be defeated in the upcoming assembly polls and "their shops will be closed after the elections".

"A person who was responsible for the recruitment of 'Bana Sahayaks' in the forest department indulged in corrupt methods. We will investigate it. Everything will be investigated. The person after indulging in corruption has now joined the BJP. He is now lecturing others," she said.

Slamming turncoats, who left the TMC to cross over to the BJP, Mamata claimed that only the "greedy ones" are joining the saffron party.

"Those who want to leave the party should do so. The doors are open. But if you are in the party you have to work like a disciplined soldier. Let me tell you, those who have switched political allegiance will be defeated in the assembly polls, their shops will be closed after the polls," she said.

The BJP can buy some corrupt leaders but it can never buy a dedicated member or cadre of the TMC, she asserted, while addressing a party meeting here.

The chief minister, raking up the "insider versus outsider" debate, also said that people of Bengal state will rule this state, and not those coming from Gujarat.

Taking a dig at the BJP for sending a chartered plane to fly TMC turncoats to Delhi for induction in the saffron camp, Mamata said they don't have funds to bear the travel expenditure of migrant workers, but would not mind shelling out money to transport corrupt leaders.