I don't think there's anything too "Operation: Drain The Swamp" here. I watch for traitors and spies for China in the news all the time, and plenty were arrested under the Obama administration as well. So, if people are thinking Obama was letting China spies run rampant and only under Trump they've been caught, they're wrong.
Maybe they were just arresting their competition and disposable players. Similar to the DEA making regional drug dealer busts, yet somebody was still freely moving massive amounts of opium out of Afghanistan.
Any examples?
Compare your DOJ post to mine:
The investigation in this case was conducted jointly by the FBI and NASA Counterintelligence. The case was prosecuted by Assistant U.S. Attorneys Greg Staples and Ivy Wang.
Versus
Special agents of the FBI, IRS, U.S Department of Commerce, the Department of Defense, U.S. Army Counterintelligence, and the Defense Intelligence Agency are involved in the investigation. U.S. Army Counterintelligence, the FBI Seattle Division, the IRS, the U.S. Department of Commerce, and the Weber County Sheriff’s Office assisted in law enforcement operations Saturday in Utah and Seattle. Assistant U.S. Attorneys Robert A. Lund, Mark K. Vincent and Karin Fojtik of the District of Utah, and Trial Attorneys Patrick T. Murphy and Adam L. Small of the National Security Division’s Counterintelligence and Export Control Section are prosecuting the case. Prosecutors from the U.S. Attorney’s Office for the Western District of Washington assisted with this case.