1. A system for providing visual suggestions for document classification via injection, comprising: a database to store clusters of unclassified documents and a set of reference documents, each reference document associated with a classification code; a comparison module to compare one or more of the unclassified documents within one such cluster to the reference documents; an identification module to identify for the cluster, one or more of the reference documents that are similar to the compared unclassified documents; an injection module to inject the similar reference documents into the cluster; and a display to display each of the similar reference documents in the cluster with a visual indicator representative of the associated classification code, to further display the unclassified documents of the cluster, and to provide a suggestion for classification for one of the unclassified documents within each cluster based on the visual indicators of the similar reference documents.