How is “pull strings” used?

In The Dark Knight (2008), one line is: “-Really? -Health inspector's not afraid to pull strings.”

Which movie is “pull strings” from?

The clip at the top of this page is from The Dark Knight (2008).

-Really? -Health inspector's not afraid to pull strings.

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to use your influence in order to get an advantage for sb

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to use your influence in order to get an advantage for sb
-Really? -Health inspector's not afraid to pull strings.

定義：Oxford Advanced Learner's Dictionary 第 9 版