In case the downvotes are for language, "dick" is also slang for a detective, sometimes specifically a private investigator[0], which I infer the parent intended in their usage.

Which isn't to say it's never been used in a double entendre with its more common meaning. See, for instance, the theme to Shaft[1].

[0] https://www.quora.com/How-did-the-term-private-dick-for-a-pr...

[1] https://genius.com/Isaac-hayes-theme-from-shaft-lyrics

They already do; they've contracts with Pinkertons to undermine union organizing.