Many labor lawyers and consultants find clients by monitoring government offices such as the NLRB regional offices, where US trade unions are required to file RC (Representation Certification) or RD (Representation Decertification) petitions which are public record. These petitions reveal the names of organizations undergoing concerted activity and the name of the union seeking recognition or an election. These petitions are also used by organizations to conduct demographic studies of concerted activity regionally in order to prepare supervisory training in anticipation of organizing. Some companies maintain libraries and offer petition logs online as a courtesy for companies which cannot conduct the research themselves.