1. A system for supplementing structured information within a data system for entities based on unstructured data comprising: at least one processor configured to: analyze documents with unstructured data specifying two or more entities of the structured information and interactions between those two or more entities; identify from the interactions within the unstructured data of the documents one or more relationships between entities of the structured information; extract attribute values from the unstructured data for one or more entities of the structured information based on a comparison of the unstructured data with one or more dictionaries each including values for a corresponding attribute of an entity within the data system, wherein extracting attribute values from the unstructured data includes: generating tokens from the unstructured data and comparing the tokens to the values within the one or more dictionaries, wherein at least one value within a dictionary includes a plurality of tokens; retrieve entity records with structured information from the data system based on the extracted attribute values; construct entity references for corresponding one or more entities of the data system based on a comparison of the retrieved entity records and the extracted attribute values; link the entity references to the corresponding one or more entities within the data system to supplement the structured information for the corresponding one or more entities with information extracted from the unstructured data, wherein the entity references include extracted attributes from the unstructured data for corresponding linked entities; and link entities of the structured information to each other within the structured information to indicate related entities based on the one or more relationships between those entities identified from the interactions specified within the unstructured data of the documents.