These are the guys we need.. now where's the number?
http://www.usdoj.gov/marshals/witsec/index.html
The Marshals Service provides 24-hour protection to all witnesses while they are in a high threat environment, including pre-trial conferences, trial testimonials and other court appearances.
In both criminal and civil matters involving protected witnesses, the Marshals Service cooperates fully with local law enforcement and court authorities in bringing witnesses to justice or in having them fulfill their legal responsibilities. A recidivism study found that less than 17 percent of protected witnesses with criminal histories are arrested and charged after joining the Program.