Who wrote the Establishment?

You're likely asking about the song "The Establishment" by the band The Kinks.

The song was written by Ray Davies, the lead singer and guitarist for The Kinks. It was released in 1967 as a single and featured on their album "Something Else by The Kinks".

The song is a satirical critique of the British establishment, which includes the government, the aristocracy, and the media.