Former Chesterfield MP Paul Holmes has been found to have bullied Liberal Democrat parliamentary candidate Julia Cambridge and the local party has also been subjected to a suspension.
Mrs Cambridge had complained to the national Lib Dem party that she had been subjected to bullying by her fellow party member between January and June, last year.
An independent investigator found there was a case to answer and after a panel hearing and an appeal, Mr Holmes was found to have bullied Mrs Cambridge.
A Lib Dem spokesman said: “Paul Holmes has been found guilty of bullying Julia Cambridge. A disciplinary panel led by a barrister concluded his behaviour was totally unacceptable.
“Mr Holmes has been given a formal reprimand for his behaviour.”
Mrs Cambridge had originally complained to the local party but claimed the matter was not being looked into so she complained to the national party.
Pending the May 7 General Election, a Lib Dem party spokesman added: “Chesterfield Liberal Democrats have been suspended by the party while an investigation is carried out. Julia is a strong and resilient candidate and we have full confidence in her ability to beat Labour in Chesterfield.”
Mrs Cambridge previously stated she did not want to comment on the matter.
Mr Holmes was Chesterfield MP following Labour’s Toby Benn but lost the seat in 2010 to Labour MP Toby Perkins.
Former school teacher Mr Holmes joined the Social Democrat Party in 1983 and was a councillor from 1987 to 1995 for Brimington South and a Chesterfield Borough Councillor from 1999 to 2003.
Mr Holmes was also the former Lib Dem Shadow Minister for Justice and sat on the Children, Families and Select Committee.