alphabet-soup

Stephen KingのThe Running Manに懐かしい食品が出て来ました。
There was a small silver flag-pin in his lapel. All in all, he did not look like a monster at all, the inheritor of such fearsome alphabet-soup bureaus as the F.B.I. and the C.I.A.
昔米国に駐在していた頃 "alphabet-soup" は子供が喜んで食べていました。ここではスープではなく、F.B.I.やC.I.A.などの頭文字の略語を示している様です。辞書の説明を見ます。
・Oxford English Dictionary: Incomprehensible or confusing language, typically containing many abbreviations or symbols.: An alphabet soup of optical technologies is available, including CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-R, DVD-RAM and DVD-RW, with even more on the way.
・The Dictionary of American Slang: An array of initialisms or acronyms : Their business-speak is alphabet soup.
・McGraw-Hill Dictionary of American Idioms and Phrasal Verbs: initialisms and acronyms, especially when used excessively. The names of these government agencies are just alphabet soup. Just look at the telephone book! You can't find anything because it's filled with alphabet soup.