Chris Hartman, director of the Fairness Campaign, announced Monday that the lawsuit filed in Jefferson Circuit Court alleges false arrest, First Amendment violations and malicious prosecution.
The demonstrators bought tickets to the Kentucky Farm Bureau's annual Country Ham Breakfast in August. They stood silently at their table in matching T-shirts, protesting the insurance company's lobbying against same-sex marriage.
Troopers arrested Hartman and two others, writing that they "attended a private event" and "did not obey instructions to disperse."
Prosecutors dismissed the charges against them in October.
The Kentucky State Police declined to comment on the lawsuit.
