Earlier quoted context omitted.
It's not just possibly more than any previous president. Public records show that he has sentenced whistleblowers to 25 times the jail time of all previous Presidents combined. He has also used the Espionage Act more than all previous Presidents combined.
I would love to see both of these facts along with citations in an easy to read single page document. Are you counting Chelsea Manning in those numbers?
I did post a link in response to another comment here, but I'd still recommend doing your own research for the big picture. The war on whistleblowers is a very recent development in US history, and no previous administration has come down in the same way as this one.
This is partially a reflection of modern technology because information is so much easier to distribute today but also because the level of serveillance carried out by the government requires keeping more secrets than ever.