Zach talks with retired ATF special agent Dan O'Kelly who helped convict Efraim Diveroli, (whose real-life arms dealing inspired the movie "War Dogs"). Dan also talks about what it was like going undercover against the Russian Mafia and shutting down a gun-smuggling operation.  
Bonus content: Dan talks about his career in the private sector as a firearms instructor and an expert-witness who has had to testify opposite his former employer in some high profile court cases on what makes a 'gun a gun' under federal law.