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Japan Karate Association's motto is 'Keepers of Karate's Highest Tradition'.
Professional Karate Association was created in 1974.
Japan Karate Association was created in 1949.
International Karate Organization was created in 1964.
Whoever said karate is wrong that is a martial art not an organization. The American Taekwondo Association claims to be one of the largest. That is the most I can help but it is better than a wrong answer.
All Japan Karate do Association. Founded by Kanken Toyama
American Karate Association
That will depend on what it is you are looking for. If there is a specific style of karate, your organization is probably the best bet. If you are looking for karate in general Mark Bishop's book Okinawan Karate is a good source. Haines Karate's History and Tradition is another source.
Thomas Casale or Sensei Casale
Shotokan Karate of America was founded in the year 1959. It is a non-profit organization that aims to teach traditional Karate-Do in the USA. It is led by Tsutomu Ohshima.
Usually the only martial artists who have proof of their ranking are those who belong to a traditional organization like the ISKF (International Sport Karate Fed.), JKA (Japan Karate Association), ITF (International TKD Fed.), WTF (World TKD Fed.) etc. Other than that, there is only the reputation of the instructor.
Jean Claude Van-Damme