It is true that the majority of WIC and food stamp recipients don’t commit fraud (at least not major fraud) to get benefits. But there are major fraud schemes that involve these programs. The DOJ announced busting a major fraud operation just a few months ago in which the conspiracy participants bilked millions of dollars from the government. The DOJ press release explains more details of it. I suppose it depends on what you mean by “major” but the Department of Agriculture does have its own criminal investigative unit, the Office of Inspector General (OIG) that investigates fraud cases in the Department’s benefits programs. For a big conspiracy like the one in the press release OIG coordinates with the FBI and other agencies.

