Leon Trotsky
Lenin's right hand and the Red Army's founder, the brilliant revolutionary Stalin out-maneuvered, erased from history, and finally had killed in exile.

Leon Trotsky organized an armed insurrection, built an army of five million men, and then lost to a rival he dismissed as a gray mediocrity. That rival was Joseph Stalin, and the contest between them decided what the Soviet Union would become. Trotsky, born Lev Bronstein in 1879 into a Jewish farming family in what is now Ukraine, was the revolution's most dazzling talent: a writer and orator of genius, and insufferably certain of it.
Lenin's right hand
In 1917 he was everywhere. As chairman of the Petrograd Soviet he ran the committee that seized the capital's bridges, telegraphs, and railways in October, handing Lenin's Bolsheviks power almost bloodlessly. Then, as war commissar, he built the Red Army from nothing. Facing White armies on every front, he conscripted former tsarist officers under political watchdogs, imposed iron discipline, and toured the fighting in a legendary armored train for two and a half years until the Civil War was won. His signature idea, permanent revolution, held that a socialist Russia could not survive alone. It needed the revolution to spread to the industrial West or it would die.
Out-maneuvered
That idea became his epitaph. When Lenin died in 1924, Trotsky was the obvious heir and the worst politician in the room. While he lectured on theory, Stalin, the dull general secretary in charge of files and appointments, quietly packed the party with his own men and built a majority. Stalin's rival slogan, socialism in one country, was both a doctrine and a weapon against Trotsky's internationalism. Trotsky was stripped of his posts, expelled from the party in 1927, banished to Kazakhstan in 1928, and deported from the USSR in 1929, put on a steamer with his family and nowhere to go.
The great heretic
For eleven years he wandered, through Turkey, France, Norway, and finally Mexico, writing furiously to expose Stalin as the gravedigger of the revolution. Stalin answered with erasure and murder. Trotsky was airbrushed out of the photographs of 1917, recast as the phantom mastermind behind every crime confessed in the Moscow show trials, and hunted through his family, whose sons died, one in Soviet hands and one mysteriously in Paris. On 20 August 1940, inside his fortified house in Coyoacan, a Spanish agent of Stalin's secret police named Ramon Mercader drove a mountaineer's ice axe into his skull. Trotsky died the next day.
Stalin had won so completely that he rewrote the past to pretend the contest never happened. But the erasure was the tell. A regime that had truly beaten an idea would not need to scrub a dead man from its photographs, invent his ghost to explain its purges, and send an assassin across an ocean to be sure of him. Trotsky lost everything except the one thing Stalin most wanted gone: the memory that the revolution could have taken another road.