Communication Agency:
Communication Organization
Communication Agency
Dissemination Organization
Transmit Organization
Etc.
Communication: convey, information; Dissemination: dissemination; Media: media; Transmit: dissemination (verb)
Although "Agency" means agency, there are many Refers to an agency, agency, and many people are not familiar with this word, so "Organization" is a good choice.
So "Communication Organization" is the best choice