If you are looking for information on concrete foundation repair, here are two foundation repair trade associations with websites:
The National Association of Waterproofing and Structural Repair Contractors (NAWSRC) calls itself “A professional trade association serving the public and waterproofing, structure, and foundation repair industries. Members of the NAWSRC are required to uphold strict standards of practice and cannon of ethics as established by the industry.” There are links to the standards and ethics statements on the website and a search tool to find members in your state.
“The Foundation Repair Association, Inc. is a professional national organization that exists to promote high ethical standards in the practice of foundation repair and to promote cooperation between the foundation repair industry and the government.” Thus sayeth their website.