The Assassins (The Hardy Boys)
Overview
 
The Assassins is a terrorist group in The Hardy Boys
The Hardy Boys
The Hardy Boys, Frank and Joe Hardy, are fictional teenage brothers and amateur detectives who appear in various mystery series for children and teens....

 Casefiles series of books.

Calling themselves simply 'the Assassins', these terrorists-for-hire are the primary adversaries of the Hardy Boys and The Network
The Network (The Hardy Boys)
The Network is an organization in The Hardy Boys Casefiles book series. The Network is a top-secret government agency in the same branch as the CIA and FBI, but even to most people in those organizations, The Network is unknown...

 in the Casefiles series.

The Assassins appear to have originated in the 13th or 14th century, although no one knows for sure.

All Assassins have a hollow tooth to hold a cyanide
Cyanide
A cyanide is a chemical compound that contains the cyano group, -C≡N, which consists of a carbon atom triple-bonded to a nitrogen atom. Cyanides most commonly refer to salts of the anion CN−. Most cyanides are highly toxic....

 capsule, and agents have standing orders to die rather than be captured.
 
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