The Denver Post is suing its former top advertising executive and two other advertising employees, alleging they tried to steal advertising clients and use the daily newspaper’s trade secrets to form their own, competing digital ad company.

The lawsuit, filed today in Denver District Court, was first reported by the Post, Colorado’s biggest daily newspaper.

The lawsuit alleges that Reid Wicoff, who had been a senior vice president in advertising and who advised the newspaper’s publisher; David Staley, a senior digital sales strategist for the newspaper; and Nicole Brennan, director of digital ad operations at the newspaper, all resigned last week after being confronted about their plan.

The newspaper alleges that, in February 2016, Staley and Wicoff began talking about leaving to form their own company and serve as the ad agency to one of the Denver Post’s major clients, and possibly others, the complaint said.

Read more at Denver Business Journal.