Stalin hated Trotsky for many reasons, one among them is that Lenin in his famous testament strongly criticized Stalin as a tough and badly educated leader while recognized Trotsky as the most intelligent politician among the Bolcheviks. In that way Trostky was a kind of impediment for Stalin to seize the whole power in Soviet Union. The party trusted Stalin and the first thing he did was to start a snare campaign against Trotsky among the high bosses of the party as Zinoviev, Kamenev and Bukharin, who finally supported Stalin in this deed. As a result Trostky was declared a traitor and expelled from USSR, living first at the border of USSR, then in Turkey and finally in Mexico. He continued writing and had an increased number of people following him, a fact enough for Stalin to order his assassination. To this end Stalin and his KGB tools used Mexican communists led by the famous muralist David Alfaro Siqueiros. They attempted to kill Trostki once unsuccessfully, then decided to change for another way, i.e. to introduce the agent Jacques Mornard, who in fact was not from Belgium as he claimed to be, but Spanish citizen Ramón Mercader del Río, son of mother born in Cuba. Mornard or Mercader finally killed Trostky, but not his ideas. In fact Stalin made a big mistake because trostkism increased and gained a lot of popularity in several countries after the death of Trostky. The present film is just an effort to show something of this fatal happening, but it is not the best in my opinion. There is no introduction to Trostki, how he was expelled from USSR, why this happened, how he arrived in Mexico. Not knowing the history, it will be very difficult to guess that Stalin was behind this assassination. The relationship of Trostki with some communists, as Frida Kahlo and Diego Rivera, is neither shown at all. The role of Trostky is played well by Richard Burton although he looked fatter than the real Trostky, but Alain Delon as Mornard or Mercader did not play this role convincingly. Mercader was a Stalinist fanatic, and this characteristic is not seen in the role played by Delon. He looked as schizophrenic rather than a man with political convictions.