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GovTrack.us U.S Congress Legislative Data
U.S. Congress data including all Members of Congress since the beginning of the United States, legislative data including bills, sponsorship, roll call votes since around 1990. -
business.data.gov.uk
Business-related data from data.gov.uk: Namespace for companies; this appears to have entries for all companies registered at Companies House. Part of package:data-gov-uk.