Soon after, Napoleon calls a general meeting, and the dogs drag out several pigs. The pigs confess that they were working with Snowball and Mr. Frederick, and a moment later the dogs killed them. After that, the same thing happens with the surviving hens from the rebellion, and several other animals. At the end, there is "a pile of corpses and Napoleon’s feet". This is an allusion to the Great Purges, which took place between 1936 and 1938. Working to eliminate every last trace of the opposition, Stalin had executed or sent to Gulag labor camps many of those that might possibly be labeled "anti-Soviet." The estimates of how many died in the purges ranges from about 500,000 up to 2 million.