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A comment on Elizabeth Warren Came Up with a Plan to Break Up Big Tech. Parent comment

Re:Elizabeth Warren Came Up with a Plan to Break Up Big Tech by bendmorris on Tuesday August 20, 2019 @03:49PM (#20751222)
The Supreme Court has held that this applies to criminal law - you can't change the punishment of a crime or change rules of evidence to convict someone who was acquitted.

You can certainly pass laws to undo a merger or (equivalently) break up a company.

https://en.wikipedia.org/wiki/Calder_v._Bull

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Re:Elizabeth Warren Came Up with a Plan to Break Up Big Tech by CWuestefeld on Tuesday August 20, 2019 @04:02PM (#20751414)
The problem's not the "ex post facto". The problem is the "Bill of Attainder". You can't pass a law that, e.g., breaks up Amazon - to do so would be to deprive them of property without trial.

But you can create a law that Amazon (and potentially others) will be in violation of, and following proper trial, they are broken up.

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