Alcoholics Anonymous is an international organization by and for people who are recovering or attempting to recover from alcoholism. AA sponsors group meetings where members support each other during the recovery process.
Narcotics Anonymous is an international organization that sponsors group meetings for people who are recovering from drug addiction and who wish to support one another during the recovery process.
The National Institute on Alcohol and Alcoholism is a division of the National Institutes of Health. The NIAAA website provides extensive information on alcohol abuse and alcoholism, as well as related research and prevention efforts.