Biography.guide
Home › People › Politician › Lev Sedov
Portrait of Lev Sedov

Lev Sedov

1906 – 1938

Son of Leon Trotsky, communist oppositionist and writer

Don't just read it — keep itBiographies to ownE-book · Audio · Video From $7 →

About Lev Sedov

Lived 1906 – 1938 (aged 31). Lev Sedov was a Russian politician, editing staff and publisher.

Lev Lvovich Sedov (, also known as Leon Sedov; 24 February 1906 – 16 February 1938) was a Russian writer and the first son and third child of politician and revolutionary Leon Trotsky, born during his second marriage, with Natalia Sedova. Sedov was born when his father was in prison facing life imprisonment for participating in the Revolution of 1905.

Life Sedov lived separately from his parents after the October Revolution to avoid being seen as privileged. He married in 1925 at the age of 19 and had a son, Lev, the following year. Sedov supported his father in the struggle against Joseph Stalin and became a leader of the Trotskyist movement in his own right.

Exile in Turkey and Germany Sedov accompanied his parents into exile in 1929, and then in 1931 he moved to Berlin to study. Alexandra Ramm-Pfemfert and her husband, Franz Pfemfert, arranged his visa and ensured that he saw an eye specialist to treat an eye disease he was suffering from. Carl Sternheim, a friend of the Pfemferts, met him during this period and described him as an extremely nice looking young man with light brown hair and blue eyes but who chain smokes and vividly explains that "he goes through fifty of them every day".

Trotsky's bloc In 1932, he helped Trotsky create a political bloc with the anti-Stalin opposition inside the USSR and was in contact with some of its members like Ivan Smirnov, through the old bolshevik Eduard Holtzman, whom he called in his letters "the informant". Sedov showed he was far more interested in using a direct aggressive policy than Trotsky, stating: "Before everything else we have to drive out the present leadership and get rid of Stalin nothing but their liquidation can bring victory". The bloc was dissolved in early 1933, according to Pierre Broué.

Exile in Paris Just before Adolf Hitler came to power in 1933, Sedov moved to Paris, where he worked as a Parisian laborer and became an important activist in the Trotskyist movement. He was frequently followed by agents of the Soviet NKVD.

Death

After an acute attack of appendicitis in February 1938, Mark Zborowski, an NKVD agent who had posed as Sedov's comrade and friend, arranged to take him to a private clinic instead of a Paris hospital. At the same time, Zborowski notified the NKVD that Sedov had been transported under an assumed name to the Clinique Mirabeau, which was operated by a White Russian with connections to Soviet intelligence, who performed an appendectomy. Complications set in after the operation, but Sedov apparently received no further treatment. He was later taken to a Paris hospital, where he died.

Some historians who have analyzed the matter believe Sedov was murdered by agents of the Soviet State who were in Paris watching him, either while in hospital or by poisoning him, causing his condition. In 1994, Pavel Sudoplatov, a lieutenant general in the NKVD who at that time was in charge of planning assassinations abroad, including the one of Sedov's father, claimed in his memoirs, Special Tasks, that Soviet agents played no part in his death. In 1956, Zborowski had testified before a United States Senate subcommittee that he had contacted the NKVD to report that Sedov had entered the clinic, and then to confirm his death.

Sedov's grave is in Cimetière de Thiais, south of Paris.

Writings Lev Sedov's major political work is The Red Book on the Moscow Trials (1936). At a time that a leftist consensus accepted the verdicts of the Moscow trials, the book analyzed them with the aim of discrediting them. It was the first thorough-going exposé of the frame-ups upon which the trials were based. Trotsky himself described it as a "priceless gift... the first crushing reply to the Kremlin falsifiers".

Biography shop

Don’t just read it —
keep it.

Full-length biographies made to live with: read them, listen on the way to work, watch them tonight.

  • E-book
  • Audio
  • Video
Browse the shop — from $7

Instant download · yours to keep · every purchase keeps this site free

Important facts

Birth century
Education
Technische Universität Berlin
Also known as
Lev Lvovich Sedov

People in Lev Sedov's life

Named in this biography and alive at the same time

Contemporaries

People whose lives overlapped Lev Sedov's

Frequently asked questions

Who was Lev Sedov?

son of Leon Trotsky, communist oppositionist and writer (1906–1938)

When was Lev Sedov born?

Lev Sedov was born on 24 February 1906 in Saint Petersburg.

When did Lev Sedov die?

Lev Sedov died on 16 February 1938 in Paris.

What was Lev Sedov's occupation?

Lev Sedov was a politician, editing staff and publisher.

What nationality was Lev Sedov?

Lev Sedov was Russian.

Sources & further reading

· Wikipedia: Lev Sedov

· Wikidata: Q543149

· DBpedia: Lev Sedov

Cite this page

APA: Biography.guide. (2026). Lev Sedov. https://biography.guide/lev-sedov/

MLA: "Lev Sedov." Biography.guide, https://biography.guide/lev-sedov/.

Chicago: "Lev Sedov." Biography.guide. https://biography.guide/lev-sedov/.

Data last updated: 2026-09-20 · Spot an error? Report a correction.

Page generated 2026-09-27 05:18 UTC