Tyb
(Yeah, yeah - Cry me a river, tele haters)
If they are fed, their jurisdiction is anywhere in the US. I don't think they are feds; they would be city PD, but let me look this up.
Well, I'll be switched. Anon, you are correct. They be federales.
https://en.m.wikipedia.org/wiki/United_States_Capitol_Polic
The United States Capitol Police (USCP) is a federal law enforcement agency in the United States charged with protecting the United States Congress within the District of Columbia and throughout the United States and its territories. It answers to the Capitol Police Board and is the only full-service federal law enforcement agency appointed by the legislative branch of the federal government of the United States.
https://wikipedia.org/wiki/United_States_Capitol_Police