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Here is the sentence including the word.

> そのドヤ街｛がい｝に住む｛すむ｝子｛こ｝どもたちをそそのかしてかれらを **部下{ぶか}となし**
CC BY-SA 3.0
2015-09-12T09:35:14.873
27959
2017-04-04T06:09:10.780
2017-04-04T06:09:10.780
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question
words renyōkei
What does the word 「部下となし」 mean?
「部下となし」 does not exist as a single idiom or set phrase -- as you should be
able to tell from the paucity of Google search results such a query will bring
up.

Instead, the なし here is the continuative form (連用形{れんようけい}) of the verb 為{な}す
(to make/turn in to):

"He tempts the kids who live in that flophouse area, and turns them into his
subordinates."
CC BY-SA 3.0
2015-09-12T13:08:20.467
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2015-09-12T13:13:50.373
2015-09-12T13:13:50.373
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answer