Recently I have been hearing a lot about gag orders given by the United States, such as Lavabit, etc. What are the actual repercussions for still talking out about the gagged subject?
Gag orders are created by courts. Violating a judicial order is Contempt of Court.
The phrase gag order is slang, not a judicial term, so you can't easily find this definition on a court website. But here's some sources:
Revealing classified information or disobeying an order from the FISA Court would most likely fall under the espionage act, Opsahl said. They could be found in contempt of court and there would be a fine
Reading up the stories on Lavabit, the federal prosecutor has the court order demanding cooperation. There is no difference between an NSA gag order and a court gag order. The government has the option to put anyone violating a gag order in jail immediately. This gets interesting for something like this, are they further placed in solitary confinement?