Two antitrust officials at the Justice Department have received their pink slips.

The fired officials, Roger Alford and Bill Rinner, were both responsible for preventing monopolies and investigating anticompetitive behavior amongst corporations. Their grounds for dismissal were not immediately apparent, though sources that spoke with CBS News Monday night claimed that their termination notices mentioned insubordination.

Alford and Rinner worked under Assistant Attorney General Gail Slater, the chief of the division. Alford was principal deputy assistant attorney general and Rinner was the deputy assistant attorney general, fronting merger enforcement. Slater had recently taken on lawsuits against several major companies, including Capital One, Apple, and Google.

Their department had become the subject of criticism from some business leaders and colleagues. Earlier this month, CBS News reported that internal friction within the team had led to conversations about potentially pushing staffers out. On July 17, Slater met at the White House with the Office of Budget and Management, the National Economic Council, and the Federal Trade Commission. Staffers at those agencies have started to question if Slater is truly prioritizing Donald Trump’s policies, or whether she is walking her own path.

Some of the team’s disagreements were sparked during investigations into T-Mobile and Hewlett Packard Enterprise, among others, according to sources that spoke with CBS.

Business leaders were reportedly unhappy with Slater after she warned them not to engage with the administration via Trump-aligned lobbyists and consultants. In one meeting between Hewlett Packard Enterprise and its prospective purchase Juniper Networks, Slater said that the businesses should only work through Justice Department officials, rather than its consultants, Trump allies Mike Davis and Arthur Schwartz, according to CBS News. Conversations of that nature ushered business-side concern to the White House, with leaders wondering why the DOJ was instructing them on who they could hire.