If you call this firm a “patent troll,” it might sue for defamation

We're not going to say that Automated Transactions LLC is a "patent troll," but several others have. The American Bankers Association has called ATL a troll. The Credit Union National Association called ATL a troll—they even illustrated the accusation with a picture of a troll. Individual lawyers, legal commentators, and banks have all described ATL as a troll. Inventor and ATL founder David Barcelou got so fed up with people labeling his firm a patent troll that he sued about a dozen individuals and organizations for libel in 2016. Last year, a New Hampshire state judge dismissed Barcelou's lawsuit.
Read more: https://arstechnica.com/tech-policy/2019/02/if-you-call-this-firm-a-patent-troll-it-might-sue-for-defamation/?source=Snapzu