The lawsuit, filed in U.S. District Court, seeks $100 million in damages, and a court order invalidating the Knight's tax-exempt status.
Among the suit's claims is the allegation that the Knights of Columbus deceptively inflates its membership numbers in order to increase its life insurance ratings.
While Judge Brooke Jackson allowed UKnight to review membership data last year, the Knights have disputed claims that they inflate numbers.
"The Knights of Columbus has a long-standing, thoughtful, and well-conceived membership retention process in place that reflects sound practices and the values of the Order," a spokesperson told Buzzfeed last week.
"One of those values is to ensure that members of the Knights provide mutual aid and assistance to fellow members of our organization."
Labriola could not be reached for comment. But the plaintiff is no stranger to litigation.
In 1993, Eller Industries, a company owned by Labriola, attempted to revitalize the bankrupt Indian Motorcycle brand by purchasing the defunct company's trademarks. Labriola signed a contract to purchase the trademarks in 1997, but a court battle began in 1998, after the brand's legal custodian said that Eller had failed to obtain financing or meet the terms of its contract.
Eller's contract with Indian Motorcycles was terminated by a federal judge on Dec. 7, 1998.
Labriola subsequently sued the brand's custodian for $2.7 million, and in the midst of the lawsuit requested that two judges recuse themselves, accusing them of "corruption, duplicity, ineptitude, hubris, and abject indifference."
In the same motion, Labriola accused Indian Motorcycle's legal custodian of "brazen temerity" and "outright lies and distortions."
Before founding UKnight, Labriola founded at least three additional companies.
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In 2002, he founded the Backyard Drills Foundation, which produced DVDs teaching sports skills. According to a 2007 article in BizWest, the DVD sets were marketed through revenue-sharing fundraising arrangements with youth football leagues. Backyard Drills was dissolved in 2007.
Two months after dissolving Backyard Drills, Labriola founded Quvico, a clean energy enterprise, which was dissolved less than a year after it was founded.
In September of 2007, Labriola founded Dinner Party Dot Com, LLC. The company was cited by the Secretary of State for failing to file required annual reports, and was dissolved in November of 2016.
According to the Colorado Secretary of State, UKnight Interactive was registered in 2011 as a trade name of List Interactive, a company founded by Labriola on the same day. In 2012 and 2015, List Interactive was cited by the Secretary of State for failing to file required periodic reports.
The UKnight lawuit has made several allegations dismissed by the court.
Among the dismissed claim's is UKnight's charge that the IRS fraudulently maintains the tax-exempt status of the Knights of Columbus, allowing the organization to commit acts of racketeering forbidden by federal law.