"Unholy alliance" refers to a partnership or collaboration between two or more parties that is considered morally or ethically wrong, often because they have conflicting interests or values. Full definition
Be that as it may, this somewhat unholy alliance of mental health professionals and lawyers has hobbled along for many decades now without major incident and, if problems arose, as they could not help but do, all concerned just looked the other way. (apfmnet.org)
«A bad combination of excessive lending fuelled by lack of effective regulation, mainly in the US, in unholy alliance with a system of incentives and pay which encouraged the most reckless and irresponsible behaviour,» he said. (telegraph.co.uk)
With the Left wing politicians, Left wing media and Left wing scientists in unholy alliance, it's democracy and science that are the endangered species in Oz. (realclimate.org)