Interpleader is a joinder device employed by a stakeholder (as the obligor is called) who does not know to which of several claimants he is or may be liable. It allows him to bring all of the claimants into a single proceeding, and to require them to litigate among themselves to determine who, if any, has a valid claim to the stake.
Stephen E. Baril,
Interpleader in Virginia,
U. Rich. L. Rev.
Available at: http://scholarship.richmond.edu/lawreview/vol13/iss2/9