Final answer:
Without a specific phrase to reference, it is difficult to determine which author popularised a particular term in 1973; however, Lawrence Alloway and Richard Hamilton are noted for their influential term creation linked to a 1956 collage.
Step-by-step explanation:
The phrase in question was popularised in 1973, but the search for a specific author who coined a famous term or phrase would require knowledge about which phrase is being referred to. In the context provided, several individuals are mentioned with regard to different terms and artistic works. Critic Lawrence Alloway and artist Richard Hamilton are generally recognized for creating the term, likely in relation to Hamilton's influential 1956 collage. While there are numerous books and authors that talk about the 1970s, such as David Frum's 'How We Got Here: The '70s' and other works that address cultural and civil rights themes, without the specifics of the phrase, pinpointing a single author is challenging.