Facebook said Tuesday that it has removed 652 pages on the social media network that were operating a coordinated political influence operation ahead of the midterm elections.

The company released a statement that said their campaigns were intended to mislead users and originated in Iran and Russia.

“We ban this kind of behavior because we want people to be able to trust the connections they make on Facebook,” the statement read.

“And while we’re making progress rooting out this abuse, as we’ve said before, it’s an ongoing challenge because the people responsible are determined and well funded.”

In two cases, Facebook’s head of cybersecurity policy said they tracked two campaigns called “Liberty Front Press” and “Quest 4 Truth” back to Iranian state media. The campaigns were followed by hundreds of thousands of people.

The Russian campaigns were tied to the Kremlin’s military intelligence unit and focused on information about Syria and Ukraine, spreading pro-Russia and pro-Assad content, Facebook said.