Amateur radio, also known as Ham Radio, is one of the last free forms of communication.
American Radio Relay League
The ARRL is the national association for amateur radio in the US. Founded in 1914 by Hiram Percy Maxim as The American Radio Relay League, ARRL is a noncommercial organization of radio amateurs.
The ARRL is the main advocate and regulator of amateur radio interests in the United States. They provide many resources to licensed hams and those interested in amateur radio.