The Security Industry Association (SIA) is a nonprofit international trade association representing electronic and physical security product manufacturers, specifiers, and service providers. SIA is the sole sponsor of the International Security Conference and Exhibitions (ISC EXPOs).
http://www.siaonline.org/

Central Station Alarm Association (CSAA) is a trade association that represents companies offering security (alarm) monitoring systems through a central station. It also represents companies that provide services and products to the industry
www.csaaul.org/

National Burglar and Fire Alarm Association (NBFAA) is the largest professional trade association in the United States with the purpose of representing, promoting and enhancing the growth and professional development of the electronic life safety, security, and integrated systems industry.
www.alarm.org/

Door Hardware Institute (DHI) is a professional organization that serves as the resource for education and information on doors, hardware, security and specialty products for the Architectural Openings Industry. DHI is the advocate and primary resource for professional development and certification, industry trends and information, and best business practices.
www.dhi.org/