American Society of Journalists and Authors - ASJA, based in New York, represents mostly free-lance contributors to magazines and newspapers..
Artists Rights Society - The Artists Rights Society is based in New York..
Authors Coalition - The Authors Coalition represents several major U.S. author organizations, including Text and Academic Authors, as a recipient of repatriated reprographic moneys for its member organizations.
Authors Guild - The Authors Guild, based in New York, represents mostly trade book authors.
California Writers Club - The Club was founded in 1909 by Jack London, George Sterling, Austin Lucas and Herman Whitaker. It provides idea exchanges among authors and opportunities to meet other authors and agents, editors, publishers.
Dramatists Guild - The Dramatists Guild, based in New York, represents playwrights.
Garden Writers Association of America - The Garden Writers Association is based in Manassas, Virginia. http://www.gwaa.org
Mystery Writers of America - Mystery Writers is based in Stamford, Connecticut.
National Association of Science Writers (NASW)
National Writers Union - The National Writers Union, formed in 1981, is affiliated with the United Auto Workers union and the AFL-CIO. http://www.nwu.org/
Novelists, Inc. - Novelists Inc. is based in Grosse Pointe Farms, Michigan.
Science Fiction and Fantasy Writers - Mystery Writers is based in Hughesville, Maryland.
Sisters in Crime - Sisters in Crime is based in Lawrence, Kansas.
Society of Children's Book Writers and Illustrators - The society is based in Los Angeles.