An
organization of federal workers, or agents, designed to secure the US against security risks that disrupt the government somehow "clearing the picture" for other departments/agencies/forces or sending in their own forces for exigent purposes. They also have a nationwide web of phone/webtaps,
informants, spies and undercover guys ("plants"). Founded in 1908 with the purpose of
fighting crime more effectively nationwide, they eventually lasted through trying times such as the Prohibition, WW1/WW2 and 9/11 and continue their work today.