Vox wrote, What forms of gun control work best? Congress bans federal agencies from finding out. and talks about the ban. But they don't go the origin of the ban. For that see, Gun violence research: History of the federal funding freeze
In 1993, the New England Journal of Medicine (NEJM) published an article by Arthur Kellerman and colleagues, ‘Gun ownership as a risk factor for homicide in the home,’ which presented the results of research funded by the Centers for Disease Control and Prevention (CDC). The study found that keeping a gun in the home was strongly and independently associated with an increased risk of homicide. The article concluded that rather than confer protection, guns kept in the home are associated with an increase in the risk of homicide by a family member or intimate acquaintance. Kellerman was affiliated at the time with the department of internal medicine at the University of Tennessee. He went on to positions at Emory University, and he currently holds the Paul O’Neill Alcoa Chair in Policy Analysis at the RAND Corporation.
The 1993 NEJM article received considerable media attention, and the National Rifle Association (NRA) responded by campaigning for the elimination of the center that had funded the study, the CDC’s National Center for Injury Prevention. The center itself survived, but Congress included language in the 1996 Omnibus Consolidated Appropriations Bill (PDF, 2.4MB) for Fiscal Year 1997 that ‘none of the funds made available for injury prevention and control at the Centers for Disease Control and Prevention may be used to advocate or promote gun control.’ Referred to as the Dickey amendment after its author, former U.S. House Representative Jay Dickey (R-AR), this language did not explicitly ban research on gun violence. However, Congress also took $2.6 million from the CDC’s budget — the amount the CDC had invested in firearm injury research the previous year — and earmarked the funds for prevention of traumatic brain injury. Dr. Kellerman stated in a December 2012 article in the Journal of the American Medical Association, ‘Precisely what was or was not permitted under the clause was unclear. But no federal employee was willing to risk his or her career or the agency's funding to find out. Extramural support for firearm injury prevention research quickly dried up.’"
Yup, one paper caused funding to be cut. See also, Firearms research: The gun fighter "There are almost as many firearms in the United States as there are citizens. Garen Wintemute is one of few people studying the consequences."