Trump uses frivolous lawsuits to silence critics- a tactic also used by the Scientologists...
http://www.wsj.com/articles/trumps-long-trail-of-litigation-1457891191

In 1984, he sued the Chicago Tribune for $500 million after its architectural critic wrote that one of Mr. Trump’s planned hotels wouldn’t be taller than the Sears Tower. Mr. Trump said the statement made it hard for him to find investors. Lawyers for the newspaper and its critic said the statements were matters of opinion that were protected under the First Amendment. A judge agreed and dismissed the case. The building was never built.
Two decades later, he sued author Timothy O’Brien, who claimed in a book, “TrumpNation: The Art of Being the Donald,” that Mr. Trump wasn’t a billionaire. The court dismissed the lawsuit saying that Mr. Trump failed to prove “actual malice” by the author.
“Donald Trump has a long history of trying to bully, intimidate or silence opponents and critics, including me,” said Mr. O’Brien, now an editor at Bloomberg L.P.
Mr. Trump recently sued a labor union for what he said was an “attempt to damage the reputation” of the Trump Hotel Las Vegas by asserting that Mr. Trump himself refused to stay there during a campaign event last year.
In a lawsuit filed last October, Mr. Trump said members of the Culinary Workers Union Local 226 distributed a flier at a campaign event that said Mr. Trump stayed at the rival Treasure Island Hotel.
“Mr. Trump is the very definition of the American success story,” the lawsuit states. “He is the archetypal businessman—a deal maker without peer.”
In the lawsuit, Mr. Trump states the flier “communicated to the public that the quality of the accommodations of Trump Hotel Las Vegas was not ‘good enough’ for Mr. Trump.”
Lawyers for the labor union countered that the flier didn’t disparage the quality of Mr. Trump’s hotel, but rather stated that workers at Treasure Island are unionized, while Mr. Trump’s hotel workers aren’t. The case is pending.
Mr. Trump sometimes threatens to file lawsuits but doesn’t follow through. In 2006, he threatened to sue Rosie O’Donnell after the television personality said he had gone bankrupt. In 2011, he said he would sue MSNBC’s Lawrence O’Donnell for saying he was worth less than $1 billion. Two years later, he threatened to sue an activist running a campaign to pressure Macy’s to stop selling products bearing Mr. Trump’s name. None of the lawsuits materialized.