George Orwell does a magnificent job representing many different groups of people in many societies, even though the backdrop for his characters is the Russian Revolution. It is interesting to see that these characters can also be seen today. For example, the dogs that protect Napoleon not only represent the secret police who protected Stalin in the early twentieth century, but are akin to any body guards used to protect any political figure or dictator today. What comes to mind currently are leaders of drug cartels who also have paid thugs to protect them.
Boxer can also represent the loyal and hard working laborers found in many nations today. They work for their own lives but also for their communities. They are also the backbone of any society because without them, the majority of the big projects wouldn't get done. Truckers and construction workers might come to mind when thinking about Boxer today; but during the Russian Revolution, they were the strong workers who were unwittingly manipulated by their own government.
Benjamin might represent professors, scholars, and intellectuals who know how the government exploits is people, but they choose to sit back and watch society ruin itself rather than do anything to help it. People like Benjamin must figure that it is safer to know and say nothing rather than get involved. They might also believe that society is too stupid to understand the complexities of what is happening around them that it is better to watch it disintegrate rather than take the time to teach others around them.
Mollie does represent those who are materialistic, but who also would rather seek after their own goals and aspirations rather than fight for what's right in their own communities. Mollie actually leaves Animal Farm in search of a different life because she didn't see that working under the pigs was what she wanted. Therefore, she might also represent capitalists or anyone else who left Russia for western countries in search of their own destinies. Rather than stay and help their home country overcome the suffering inflicted upon them, they chose to get out and seek their own fortunes elsewhere. This was difficult during Stalin's rule, however, because many were unable to leave Russia at all.