" In 2016, there were about 100,000 full-time federal law enforcement officers in the United States and U.S. territories who primarily provided police protection, compared to 701,000 full-time sworn officers in general-purpose state and local law-enforcement agencies nationwide.
" About two-thirds of all full-time federal law enforcement officers worked for either Customs and Border Protection (33%), the Federal Bureau of Prisons (14%), the FBI (10%), or Immigration and Customs Enforcement (9%).
" Between 2008 and 2016, the Amtrak Police had the largest percentage increase in full-time federal law enforcement officers (40%), followed by the National Park Service Rangers (29%) and the Bureau of Indian Affairs (27%).
" The Bureau of Indian Affairs experienced the highest rate of assaults on officers in 2016 (143 assaults per 100 officers), which was more than triple the rate in 2008 (38 per 100) and more than 20 times the rate of any other agency."
Connor Brooks. Federal Law Enforcement Officers, 2016 - Statistical Tables. NCJ 251922. Washington, DC: US Dept. of Justice, Bureau of Justice Statistics, Oct. 2019.