20. A system for suggesting custodians subject to a litigation hold, comprising: a processor communicatively coupled to a non-transitory memory; a receiver to receive an identification of a first set of custodians subject to a litigation hold; an identifier to identify a set of documents, each document in the set of documents being relevant to the litigation hold and related to one or more custodians in the first set of custodians; a custodian suggester implemented on the processor to determine, a suggested set of custodians based on a custodian graph between the first set of custodians and a suggested set of custodians that indicates a relationship between the first set of custodians and the suggested set of custodians based on the set of documents, wherein each custodian in the suggested set of custodians is associated with one or more documents in the set of documents and wherein each custodian in the suggested set of custodians is external to the first set of custodians; and an output unit to provide the suggested set of custodians to a user for litigation hold candidacy.
20. A system for suggesting custodians subject to a litigation hold, comprising: a processor communicatively coupled to a non-transitory memory; a receiver to receive an identification of a first set of custodians subject to a litigation hold; an identifier to identify a set of documents, each document in the set of documents being relevant to the litigation hold and related to one or more custodians in the first set of custodians; a custodian suggester implemented on the processor to determine, a suggested set of custodians based on a custodian graph between the first set of custodians and a suggested set of custodians that indicates a relationship between the first set of custodians and the suggested set of custodians based on the set of documents, wherein each custodian in the suggested set of custodians is associated with one or more documents in the set of documents and wherein each custodian in the suggested set of custodians is external to the first set of custodians; and an output unit to provide the suggested set of custodians to a user for litigation hold candidacy. 23. The system of claim 20 , wherein the suggested set of custodians is determined based on proper names found in one or more documents.