The Obama administration has prosecuted more whistleblowers than all other presidents combined.
This administration has also obtained much longer jail sentences against whistleblowers than previous presidents.
ACLU legislative counsel Gabe Rottman noted last October:
The Obama administration has secured 526 months of prison time for national security leakers, versus only 24 months total jail time for everyone else since the American Revolution.
(So – as of October – Obama had thrown whistleblowers in jail for 22 times longer than all other presidents.)
https://washingtonsblog.com/2015/05/obama-has-sentenced-whistleblowers-to-31-times-the-jail-time-of-all-prior-u-s-presidents-combined.html
He also fired multiple Inspectors General, IIRC.