The Federal Bureau of Investigation and other agencies quietly resumed coordinating with the major social media companies earlier this year to fight what government officials warned was a coming onslaught of foreign disinformation and influence operations leading up to the presidential election in November. In at least two instances in recent weeks, the companies have taken action to remove malign content, according to the Biden administration and company officials.

Contacts between F.B.I. investigators and the companies — including Facebook, X and YouTube — ground to a halt last year as a legal challenge that accused the Biden administration of censorship wound its way to the U.S. Supreme Court.

In June, the court rejected the challenge, one of the first to wrestle with how far the government could go to combat misinformation and disinformation online. It left unanswered what limits, if any, the First Amendment could impose on the government’s ability to communicate with the technology companies.

The communication between government agencies and the platforms has resumed as Russia and Iran have stepped up efforts to interfere in the U.S. presidential election. Intelligence gathered and shared by the government has previously flagged covert influence campaigns before they could take off on social media.

The F.B.I.’s communications with the platforms resumed behind the scenes in February, according to the officials and a report by the Department of Justice in July, and they have already thwarted two campaigns spreading information from Russia’s propaganda apparatus.

Last month, X voluntarily closed 968 accounts that the Department of Justice linked to Russia’s Federal Security Service and RT, the state television network. On Thursday, Meta disclosed that a tip from the F.B.I. had led to the removal of a broad web of inauthentic pages and accounts on Facebook and Instagram disparaging Ukraine, Poland and the European Union.