Question

نظارت بر لنج ها قاچاق کالا را کاهش میدهد

Answer 1

Controlling / Monitoring the (shuttle) boats / launches will decrease / reduce illicit/ smuggled goods / contraband merchandise. / smuggling (rate).

Comments

https://en.wikipedia.org/wiki/Launch_(boat)

launch 

http://listdose.com/top-10-most-smuggled-things-in-the-world/

Smuggling of goods started in the middle ages since goods started getting taxed.

Dear Mr.Silverman

If I were you, I would choose Mr.Bozorgmehr's answer as the best answer. His answer to your question is excellent.

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Dear Mr.Keramus,

Thanks a lot.