The phrase "dirty thirty" has been applied to a list of thirty corporations that the Japanese government saved from bankruptcy when an economic bubble burst in the early 1990s
Payments on the bad loans to these corporations was estimated to consume a tenth, or more, of the Japanese Gross National Product.
Lost Decade (Japan)
Shane Green (October 12, 2002). "Dealing with the great undead". The Age. http://www.theage.com.au/articles/2002/10/11/1034222594896.html. Retrieved 2008-01-09. "But beyond his hard-nosed rhetoric there is a belief, more like a fear, that Kimura, a former Bank of Japan official, has a list of 30 companies that fit the walking dead description. Known as the Dirty Thirty, the names are allegedly a hit list of companies that should be cut loose and bankrupted."