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!"

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