Here is one and there is another. They are for Aleksandr Voskresensky and my cousin Lydia Voskresenskaya, and her sister Eugenia Nersessova and her husband. In November, 1921 they were arrested and held in Butyrskaya Prison until December.
The site the letters are on seems to be about political prisoners 1918-1922 and 1922-1938. It is very inconvenient not to read Russian.