Large numbers of complaints that must reach disciplinary authorities before action is taken to discipline or protect the public. Especially relates to attorneys and their bar associations who oversee grievances and egregious, unethical conduct. Also can relate to doctors, police, etc. Ultra Critical Mass can take years, decades, or an entire career before it is reached. The implication is that large numbers of people are harmed by a single individual while Ultra Critical Mass is building. Is often the product of biased reviewers, cronyism, and/or bureaucracy.
The file cabinet containing attorney Doe's voluminous complaints finally collapsed; the bar is now investigating some of those complaints; Ultra Critical Mass has occurred.