Who does orwel suggest is responsible for spreading the idea that snowball visits the farm at night?

In George Orwell's "Animal Farm," Napoleon suggests that Snowball is responsible for various misfortunes on the farm, including the idea that he sneaks onto the farm at night. He uses Squealer, the Propaganda pig, to spread these rumors, instilling fear among the animals and consolidating his power. This tactic serves to divert attention from Napoleon's own failures and to create a scapegoat in Snowball.