One Day in the Life of Ivan Denisovich
We never actually see Pantleyev because he plays hooky. Pantleyev seems universally hated in Gang 104, and with good reason: he is an informant for the guards and he gets off work in order to rat-out fellow prisoners. Pantleyev has completely sold out and is even lower than Fetyukov in terms of principles. Though he's not featured in the book in person, Pantleyev helps to show how corrupt the camp is and also how dangerous it is: there's always some sort of surveillance going on, even inside of the work gangs themselves.