Hi,
In 2007, there was some significant conflict on the French Wkipedia, when people working for the nuclear industry edited related articles, and denied anyone without a PhD on nuclear physics any autority about this subject. Further more they refused any reference from outside the nuclear industry, specially from NGOs critical about this (i.e. Greenpeace). The result was that some articles on this subject were pure propaganda. Any mentions about incidents or accidents were systematically removed or reworded to conform to the view of this industry. These people are not paid to edit Wikipedia, so they denied having a conflict of interest. I haven't checked if the situation has changed since that time.
I would like that a situation like this being taken into account, but it may be outside the scope of your request.
Regards,
Yann