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I wasn't able to find any matches through dictionaries for 足のつかない or 足がつかない.

Here is the sentence:

> 消えても足のつかない人間をさらっては上の集団に引き渡すらしい

The context is thugs kidnapping people for money.

I don't understand 足のつかない. My impression is that it means 'not having one's
feet on the ground'. But I think there's probably a more metaphorical meaning
for it in this sentence.

Thank you
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meaning idioms
Meaning of 足のつかない?
The idiomatic expression refers to not having any leads. See the explanation
for 足がつく [here](http://www.ymknu200719.com/kotowaza/koto-a-0045.html).

So the phrase in your example is actually referring to a person who has
disappeared without a trace.
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In this sentence, 足のつかない人間 means "people who you would not pay attention to if
they disappeared." So they're probably criminals, the homeless or someone
living out of the society. Though it depends on context, I think 80 percent of
the expression “足のつかない人間” have this connotation.
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The usual interpretation of this idiom is such:

> [**足【あし】が付【つ】く**](https://dictionary.goo.ne.jp/jn/3640/meaning/m0u/)
>
> **１** 犯人の身元や逃亡者の行方がわかる。犯罪事実が明らかになる。「残された指紋から―・く」  
>  _(the culprit's identity or the fugitive's whereabouts becomes known; the
> fact of crime becomes clear)_

Meanwhile, the context seems to be from [an episode of
デュラララ!!](http://dhurarara-ioio.blog.so-net.ne.jp/dhurarara-06)

> 甘楽「私が聞いた噂じゃ、消えてるのは地方から家出して来た子たちや、不法滞在の外国人。  
>  甘楽 て、つまり、消えても後[sic]が残らない人たちですけどね～。  
>  甘楽 そういう人たちが、池袋から渋谷の間で大勢消えてるみたいですよ。  
>  甘楽 しかも一度消えたら２度と見つからない。  
>  ︙  
>  岸谷新羅「実行部隊はどこかの悪徳企業の下請け。まあ、下っ端の下っ端だね。  
>  岸谷新羅 **消えても足のつかない人間をさらっては、上の集団に引き渡すらしい。**

Then we have two ways of interpretation on this phrase, though neither makes
much difference in understanding of this plot.

> 消えても足のつかない人間
>
>   * people who are not traceable when they are missing
>   * people who don't lead to exposure of their (the company's) crime on
> their disappearance
>

On why the second reading is valid, see [this
post](https://japanese.stackexchange.com/a/14550/7810).
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