A "house organ" is a
periodical (e.g., a
magazine) produced by a company and focuses on the company. It's generally for internal and external publicity. By its very nature, a house organ is overwhelmingly positive in its
editorial approach towards company affairs. Where the worlds of publishing and politics meet, "house organ" is frequently used in a pejorative sense for a magazine or
newspaper that is overly
partisan for a political party, corporation, or ideology. Consider:
"
The Wall Street Journal is nothing but a house organ for the
republican party!"