Do property managers work for the Board, condo owners, or both?

I am a condo owner in a Massachusetts Condo Association.

The Association is having difficulties with a secretive and controlling Board of Directors, as they are insular and regard challenges to their decisions as threatening and insulting. The condo owners are in no way rude or out of control, they are merely seeking information.

An attempt was made to have our Condo Association property manager intercede, but they are claiming that they work for the Board and not the condo owners. If this is true, who works or advocates for condo owners?

Advice would be appreciated!