The European Union threatened to crack down on an agreement between Google and Facebook parent Meta for online display advertising services, saying Friday that the deal may breach the bloc’s rules on fair competition.

The EU’s competition watchdog opened a probe into a 2018 pact involving the participation of Meta’s “Audience Network” in Google’s “Open Bidding” program.

The European Commission, the EU’s executive arm, said the deal may be part of an effort to exclude ad tech services that compete with Google’s Open Bidding program — which would harm publishers and consumers.

Internally, Google used the code phrase “Jedi Blue” to refer to the 2018 agreement, according to the lawsuit. Google kept this code phrase secret, The AP reported in January.

A lawsuit was filed by several US state attorneys general in January over many of the same issues.

Google, Facebook execs were involved in ‘anti-competitive conduct,’ lawsuit alleges

“If confirmed by our investigation, this would restrict and distort competition in the already concentrated ad tech market, to the detriment of rival ad serving technologies, publishers and ultimately consumers,” European Competition Commissioner Margrethe Vestager said in a statement Friday.

The United Kingdom has launched its own inquiry into the agreement between Google and Meta.

The European Commission said it has been in contact with the U.K. competition authority and “intends to closely cooperate on this investigation following the applicable rules and procedures.”