Ecclesiastical, the Anglican church's insurance company, is sacking 80 staff without prior warning despite an underwriting profit of more than £5m last year.
Finance union Unifi said the company was reneging on its agreement to consult at the earliest possible stage to avoid compulsory redundancies.
Ecclesiastical, which employs 900 staff nationwide, is run to generate profit for the Anglican Church and the company says this 'restructure' is aimed at making an annual saving of £1.25m.
Unifi says Ecclesiastical's 2002 profits were the highest since 1996 and half-year predictions for 2003 show further increases.
Terry Keefe, Unifi national officer, said: "This the fifth time in less than 12 months that the company has acted in this way - on one occasion with less than 24 hours' notice. For a company that calls itself an ethical employer this is a barbaric way to behave towards staff."