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Re:Brazilian Judge Shuts Down WhatsApp for 48 Hours by rccrv on Wednesday December 16, 2015 @10:51PM (#10749395)
It wasn't Congress that decided that.

It is a single judge that gave an order to block the service for 48 hours.

It can be reversed if another judge decides the "liminar" (I don't know how to say this in English, it's a temporary decision) shouldn't been given.

Re:Brazilian Judge Shuts Down WhatsApp for 48 Hours by jessaustin on Wednesday December 16, 2015 @11:16PM (#10749501)
"Injunction", perhaps?
Re:Brazilian Judge Shuts Down WhatsApp for 48 Hours by rccrv on Wednesday December 16, 2015 @11:25PM (#10749533)
That is a good equivalent and it gives some idea of what happened for those familiar with the concept. Thanks for the clarification.