official bulletin; organization newspaper or journal; party organ
A publication issued by a political party, association, company, research society, or other organization to communicate its views and activities. 機関紙 usually refers to a newspaper-style publication, while 機関誌 refers to a magazine or journal.
The party organ reported the details of the new policy.
研究会の機関誌に論文が載った。
An article appeared in the research society's journal.
That organization publishes its own party newspaper.
The labor union publishes its party newspaper every month.
They printed the party's policy in the bulletin.