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not theory..

https://oglobo.globo.com/opiniao/a-mafia-o-cartel-18005151 (portuguese)

http://www.fcpablog.com/blog/2015/9/15/brazil-investigates-big-banks-for-exchange-rate-manipulation.html

https://www.law360.com/articles/870459/brazil-fines-foreign-banks-54m-for-currency-manipulation

it's about the manipulation of BRL / USD for years, the operation took off billions from brazilian economy. this is still under investigation.

names

Citigroup, Bank of America, Barclays, Deutsche, HSBC, Merril Lynch, Morgan Stanley, JP Morgan Chase, Royal Bank of Canada, Nomura, Tokyo-Mitsubishi, Royal Bank of Scotland, Standard, Credit Suisse e UBS

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