A fresh investigation has been launched into Walsall Council over allegations that four members of staff were sacked for refusing to cover up illegal practices.
West Midlands Police has referred a previous probe into corruption to the Independent Police Complaints Commission days after local MP Bruce George spoke about a former council worker whose life was threatened after he refused to cheat council taxpayers.
The local authority last year claimed it was cleared of any wrongdoing following a string of investigations into the dismissal of four members of staff who blew the whistle on corrupt practices dating to 2003.
Walsall South MP Bruce George stood up in the Commons on Friday and demanded a fresh inquiry into the sacking of four council officials - Peter Francis, Liz Macdonald, David Parish and Mark Kemp.
He highlighted the case of Mr Kemp, a former surveyor who began work at the establishment team of the education department at Walsall Council in 2003.
Mr George said: "It was not long before he was introduced to what appears to have been a long-standing, unofficial working practice of bungs between contractors and some employees. He declined to participate, was ostracised, assaulted five times - once in the council house - and was sent a dead, decaying rat through the post.
"Someone called at his house and threatened his 75-year-old mother's life. He was savagely beaten in his garden by two assailants. He was dumped in a pond in the back of his garden and could have drowned. He was then fired on spurious grounds. He did not surface because he was told, 'Go to a tribunal and you're a dead man'."
Walsall Council chief executive Paul Sheehan said Local Government Minister John Healey had told the Commons that independent investigations - including an inquiry by West Midlands Police - had found no evidence of wrongdoing.
But West Midland Police Chief Constable Sir Paul Scott-Lee opted to refer the inquiry to the IPCC following complaints that the previous police investigation was flawed.
In a letter to Mr George, Sir Paul said that investigation concluded there was insufficient evidence for a realistic prospect of conviction, but since then advice from the Crown Prosecution Service had prompted the need for a new inquiry.
Sir Paul wrote: "Given this matter is of significant public interest and further claims made by Mr Mark Kemp concerning the conduct of the investigation, I have taken the decision to voluntarily refer the matter on the Independent Police Complaints Commission to oversee the continuing investigation."
A West Midlands Police spokesman said: "We can confirm it has received an official complaint regarding the conduct of its investigation into allegations of corruption within Walsall Borough Council.
"The complaint is being investigated by the force professional standards department having been voluntarily referred to the Independent Police Complaints Commission and is ongoing."
Mr Sheehan said yesterday: "All members have been made aware of the proceedings in the Commons on Friday afternoon as it relates to Walsall Council.
"I have written to the Minister and offered to provide any information he may need for his meeting with the Walsall MPs.
"Allegations of assault and or fraud are a police matter and should be dealt with by the police.
"If there is a police investigation into these allegations we will be happy to assist in any way we can."