Ahead of November’s election, American intelligence officials and others are on high alert for mischief from Russia’s Internet Research Agency.

Remember it?

The Kremlin-backed group was identified by American authorities as having interfered in the 2016 election. At the time, Russians working for the group stole the identities of American citizens and spread incendiary messages on Facebook and other social media platforms to stoke discord on race, religion and other issues that were aimed at influencing voters.

To avoid detection, the group has since evolved its tactics. Here are five ways its methods have shifted.