Lobbyists (industry associations) are the interface between government and business.  They work for the best interests of the industry and try to persuade governments to support them on issues.   

Industry associations often provide information and data to the public.   To find the relevant association(s) for your industry,  search google for  the industry + country + association.   A few examples:

Many non-governmental organizations are critics of industry.  They act as a watchdog for the public and lobby governments to be diligent in overseeing activities of an industry.  To find relevant NGOs, search google by keyword(s) + protection or organization.  A few examples:

Think tanks are independent, nonpartisian, public policy research institutes that are often non-profit such as the C.D.Howe Institute, Macdonald-Laurier Institute, American Enterprise Institute, Brookings Institute, etc.  They do not have an agenda as many NGOs have, but conduct research and analysis on current issues and topics.  Hillwatch provides a listing of key Canadian and international think tanks and Harvard Kennedy School provides a searchable database of over 600 listings.  

Government Sources

Canada

Regulations (Canada Business Network)

To find the names of associations and companies that are currently lobbying goverment see Lobbying statistics - Subject Matter in Monthly Communication Reports
To stay on top of proposed regulations - Canada Gazette
To see  the Government's regulatory intentions - Government-Wide Forward Regulatory Plans
Departmental/Agency Plans (DPs) describe the priorities and programmes for the next fiscal year, along with the expected outcomes
 

United States

Office of Management and Budget (OMB) - Budget appendix contains financial information on individual programs and appropriation accounts
Government Accountability Office (GAO)  - role is to improve the performance and accountability of the federal government
Electronic Code of Federal Regulations, Federal Register (updates the Code) and Reginfo.gov