Japanese Communist Party
Political party in Japan
The Japanese Communist Party (日本共産党, Nihon Kyōsan-tō; abbr. JCP) is a major political party in Japan. Founded in 1922, it is the oldest active political party in the country. It had 250,000 members as of January 2024, making it one of the largest non-governing communist parties in the world. The party is chaired by Tomoko Tamura, who replaced longtime leader Kazuo Shii in January 2024.
The JCP, founded in 1922 in consultation with the Comintern, was deemed illegal in 1925 and repressed for the next 20 years, while continuing its activities underground. After World War II, the party was legalized in 1945 by the Allied occupation authorities, but its unexpected success in the 1949 Japanese general election led to the "Red Purge", in which tens of thousands of actual and suspected communists, along with their sympathizers, were fired from their jobs in government, education, and industry. The Soviet Union encouraged the JCP to respond with a violent revolution, and the resulting internal debate fractured the party into several factions. The dominant faction, backed by the Soviets, waged an unsuccessful guerrilla campaign (Mountain Village Operation Units) in rural areas, which undercut the party's public support.
In 1958, Kenji Miyamoto became the JCP's leader and moderated the party's policies, abandoning the previous line of violent revolution and extremism.
The public source identifies “Japanese Communist Party” as political party in Japan. This brief keeps that definition visible, then builds a research path around Japanese, Communist and Party.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Japanese Communist Party”, the useful work is to connect “political party in Japan” to the records capable of establishing context and consequence.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 24, 2026. The linked authority identifier is Q641600. VIAF identifies the subject as 122486074. The Library of Congress control number is n80049718. 4 of 6 selected statements include explicit references; 2 carry qualifiers and 0 use preferred rank. The first chronological checks are 1922, 2024, 1925 and 1945.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Japanese Communist Party”, its source revision and the description used here.
- Expand the search: follow Japanese Communist Party primary sources, Japanese Communist Party archive and Japanese research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Japanese Communist Party”?
- Which cited source is closest to the event, object or claim?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “Japanese Communist Party” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.