The hedge fund received criticism from Sen. Charles Schumer earlier this week.

Alden Global Capital now owns about one-third of Tribune Publishing, according to a new SEC filing. A week after buying a big stake from Michael Ferro, the hedge fund later boosted its holdings to 32% of the company.

An SEC filing shows that Alden Capital bought roughly $145.4 million in Tribune shares for between $10.84 to $12.98. The company paid $13 per share for the Ferro stake.

Alden Global Capital and Newspaper Worries

The hedge fund backs MNG Enterprises, a media firm with a reputation around newsrooms. The company has traditionally cut costs, including reporters and technology. Earlier this year, it also attempted to purchase Gannett, the publisher of USA Today. However, New Media Investment Group outbid the hedge-fund-backed group.

Meanwhile, Alden already owns 60 daily newspapers, including the Denver Post, the Boston Herald, and the St. Paul Pioneer Press.

News of Alden’s stake in Tribune Publishing has also generated concerns from media unions all the way up to the halls of the U.S. Senate.

The Chicago Tribune Guild, a newsroom union said, “We are deeply concerned about Alden Global Capital’s new stake in Tribune Publishing.”

Finally, Senator Charles Schumer (D-New York) said he will be watching Alden Global due to Tribune’s ownership of the New York Daily News.

“Any plans to reduce the size, scope or impact of the New York Daily News, as Alden has done in the past to other prominent newspapers, will be met with fierce resistance,” Schumer said in the statement.

Related: Sen. Charles Schumer to Watch Alden Global “Like a Hawk”