The DOJ is executive. Justices are nominated by the president and confirmed by the senate. If a judge is pleasing enough to the president (& senate), they can

The DOJ is executive. Justices are nominated by the president and confirmed by the senate. If a judge is pleasing enough to the president (& senate), they can be appointed to the supreme court. Certain individuals may be pursued more or less aggressively by the DOJ. You got your Joe Arpaios who do their thing for years and years and declare that they won't co-operate with investigations, and wind up with a Trump pardon. And Jeffrey Epstein in the 2005-2008 years. On the other hand you have your Snowdens, Assanges, Kim Dotcoms and Aaron Swartzes that the US will happily pursue indefinitely and across borders.