Mr Finnegan was originally suspended for alleged audit issues (LGC, 21 April 2005). But email messages between him and then council leader Mike Storey (Lib Dem), which contained unflattering remarks about then chief executive Sir David Henshaw, were discovered during the audit probe.
Mr Finnegan wrote to council chief executive Colin Hilton: 'I have now been suspended for 18 months, at a disgraceful cost to the council taxpayers of Liverpool.
'The council should apologise for this waste of public money in pursuit of what appears to be an astonishing vendetta against me.'
Mr Finnegan said he was suspended after following instructions from Cllr Storey to make clear his opposition to a pension deal suggested for Sir David.
The council declined to discuss individual staff matters.