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A Swedish scandal with a man who confessed to more than 30 murders, which he did not commit: https://en.wikipedia.org/wiki/Sture_Bergwall

He was convicted of eight murders. All confessions were "repressed" memories induced by therapists.

[averagewall]

It also happened in Iceland in the 1970s:

http://www.bbc.co.uk/news/special/2014/newsspec_7617/index.h...