What was the first organization formed to protect free speech in the united states?

The answer to this question is: American Civil liberties Union
The American Civil liberties Union was first created in 1920 which mission is to guarantee any form of individual rights and liberties, such as the right to voice your opinion (freedom of speech), the rights to choose your religion, the rights to not discriminated again, the right to live, etc.

Protecting and assisting  u.s. citizens  living or traveling abroad; assisting u.s.  businesses  in the international marketplace; coordinating and providing support for international activities of other u.s. agencies (local, state, or federal government), official visits overseas and at home, and other diplomatic efforts.keeping the public informed about u.s. foreign policy and relations with other countries and providing feedback from the public to administration officials.providing  automobile registration  for non-diplomatic staff vehicles and the vehicles of diplomats of foreign countries having  diplomatic immunity  in the united states