This article analyses letters sent by Soviet citizens to newspapers and authorities during the Brezhnev era, supposedly a period of political stagnation. Citizens wrote critical letters, individually and collectively, signed and anonymously, to have problems solved. Authorities responded to citizen concerns, which were mostly very specific and non-systemic, and also used the letters to monitor public opinion. The practice of letter writing in the Soviet Union in this period enabled citizens to hold authorities to account while also providing leaders with the opportunity to legitimise their authority by taking action.