They actually do both! https://en.wikipedia.org/wiki/United_States_Secret_Service#Dual_mission https://en.wikipedia.org/wiki/United_States_Secret_Service#D...

They actually do both! https://en.wikipedia.org/wiki/United_States_Secret_Service#Dual_mission https://en.wikipedia.org/wiki/United_States_Secret_Service#D... The original mission of the Secret Service was investigating financial crimes; protecting people was only added later. They even used to be a branch of the Department of Treasury.