What is the definition of Transnational Crime? Academic Help

I need an explanation for this Law question to help me study.

What is the definition of Transnational Crime? What are their challenges to law enforcement agencies in the US?

Please post your Word count at the end of your text submission. Remember references minimum of 3 must be submitted in APA format.

Please use APA style, 12 point font ( Ariel, Times New Roman). The Assignment response should be a minimum of 500 words, must post your word count. In addition, I require 3 sources of information that you used to defend your response. These references should be listed at the end of your written text in APA format. Copy and paste of URL, Wikipedia, or any other internet source that is unidentifiable will not be accepted and you will lose points.