"Barnard says that one of the most striking patterns in his research is the degree to which criminal justice officials could not understand any of what they were told by defendants." https://www.atlasobscura.com/articles/thieves-cant-in-convict-era-australia
Note: by "exclusion" I mean the closing of an in-group against all others; this is a necessary survival mechanism for the repressed and dispossessed.
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