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Once you sign up for your MoZ 30 day trial click MoZ Pro, and then link explorer on the MoZ Nav bar. Type in your competitor's url and it will show you all of their links. Depending on what kind of link it is determines if you are going to want to move in on acquiring the backlink, and how to go about doing it. I recently wrote on article on this particular subject matter, and effective ways to Steal Your Competitors Backlinks.