The DOJ was Obama’s political command center. It guided the spying on Trump, covered up the crimes and abuses which made that happen, and it covered up Clinton’s crimes.
It also carried out Obama’s particular community organizing agitation schemes, such as coordinating the riots in Ferguson and Baltimore, and the rise of #BLM.
Don’t forget that Obama’s DOJ instructed prosecutors to strike settlement agreements with big companies that directed them to make payouts to radical leftist groups. This was what Republicans decried as a “slush fund” and was the primary funding source for many anti-American / communist groups. And WE paid for it out of our taxes. That was one of the worst abuses of DOJ in history, IMO.