Instead of going after the betters a secret indictment was passed which was then used to arrest an exec of the company because of course American laws apply to any business done over the internet...
https://en.wikipedia.org/wiki/David_Carruthers
The general view of people in that industry was that it is A-Ok for Americans to gamble, but not ok for them to gamble abroad.
Specifically, the suggestion was made that by several political figures that he shouldn't be charged until after extradition. Since treason charges can carry the death penalty, and would thereby block extradition from no-death-penalty Sweden, it was proposed that he should be extradited to answer a subpoena (no legal issue), and then immediately charged when delivered to the United States.
To my knowledge, this is pretty bizarre. It blatantly circumvents the intent of most extradition agreements, which is to only extradite where the crime and penalty are acceptable in the host company. Not exactly 'secret charges', since it made the news, but at least an open secret where a subpoena would be issued specifically to avoid normal procedures.
(Of course, nothing ever came of it that I saw. I don't mean to claim there are secret charges, only that this idea might be what people meant.)
Because, in that case, wouldn't you want to keep that information under wraps in quite a few cases, and completely legitimately? Preparing to arrest a foreign drug dealer when he's expected to come to the US comes to mind.
Just because it's "secret" doesn't make an evil conspiracy against democracy. The accused's rights are protected at trial, where the public cannot be excluded except in extreme circumstances. But they don't get to watch the investigations on C-SPAN.