Assassination of E. Hemingway

For a fan of historical fiction, An Assassination of E. Hemingway has it all, a thriller filled with conspiracies, revolutions, double-dealing, lies disguised as propaganda, assassination, and wars.
Pasha, the central character, made his choice between Trotsky and Stalin. That choice cast a forty-six-year shadow over him from 1917 in Petrograd, Germany, Spain, Mexico to Cuba in 1959. Dealt a bad hand, Pasha played it to the end, with a bit of help from some friends.
Internally, Pasha started to have misgivings about his passion for the Revolution and international Communism. Doubts gradually eroded his convictions. Outwardly, Pasha faced an evil life-long nemesis and, at the same time, the long reach of a KGB death warrant.
What will be the consequence of that choice made back in 1917?