Bit of an editing war going on on the people's encyclopedia about the local once-and-future pizza chain: The current owners of the name keep trying to delete references to past Labor Department investigations into the chain's treatment of immigrant workers and Wikipedians keep putting them back in.

Here's the entire Upper Crust entry you would have seen at 5:39 p.m. yesterday, after somebody claiming to be from the current ownership was done editing:

The Upper Crust Pizzeria is a Boston, United States based chain of pizzeria restaurants. Founded by Jordan Tobins, the first location opened in Beacon Hill in 2001. It has won local accolades such as "Best Gourmet Pizza" (Boston magazine) and "Boston's Best Pizza". (The Improper Bostonian) By May 2009, the chain had grown to 14 locations and 17 by July 2010. In April 2011 the Upper Crust opened its 21st location, and its first outside of New England, in Washington, D.C. and announced plans to open additional restaurants in the DC area over the next five years. In 2012, the company went through a reorganization, and the company now plans to expand the brand nationally over the next several years.

Whoever made the changes wrote in the "history" area of the page:

Took out libelous material as the company is under new ownership. ... For questions, please contact UC Acquistion Co LLC's attorney, Christopher Panos. This page is being monitored for libel, and the new ownership will take appropriate steps to address those contributing to libeling the new company ownership.

Exactly three minutes later, a Wikipedian restored the prior entry, which had a long section about "Department of Labor findings and subsequent lawsuits and investigations," along with a link to a Wikipedia page about working through the site's dispute-resolution process before threatening a lawsuit.

Whoever took out all the lawsuit stuff returned about 50 minutes later and again deleted all the lawsuit stuff. The Wikipedian put it back. This went on for a couple of hours. The deleter had his or her IP address blocked from Wikipedia editing for 24 hours for violating a rule against repeatedly "reverting" the work of other editors.

More Wikipedians poured in overnight to discuss the whole thing, including whether to include material from a Globe article that one editor could not find - but which another editor promptly did. As of a few minutes ago, the Upper Crust entry still has a section on the Department of Labor and the lawsuits.