Secular Jewish socialist movement
Bundism was a secular Jewish socialist movement whose first organizational manifestation was the General Jewish Labour Bund in Lithuania, Belarus, Poland, and Russia (), founded in the Russian Empire in 1897.
The Jewish Labour Bund was an important component of the social democratic movement in the Russian empire until the 1917 Russian Revolution; the Bundists initially opposed the October Revolution, but ended up supporting it due to pogroms committed by the Volunteer Army of the anti-communist White movement during the Russian Civil War. Split along communist and social democratic lines throughout the Civil War, a faction supported the Soviet government and eventually was absorbed by the Communist Party.
Bundist movement continued to exist as a political party in independent Poland in the interwar period as the General Jewish Labour Bund in Poland, becoming a major political force within Polish-Jewish communities. Bundists were active in the anti-Nazi struggle, and many of its members were murdered during the Holocaust.
After the war, the International Jewish Labor Bund, more properly the "World Coordinating Council of the Jewish Labor Bund", was founded in New York, with affiliated groups in Argentina, Australia, Canada, France, Israel, Mexico, the United Kingdom, the United States, and other countries. 
Though extant after the war and undergoing a revival in the 21st century, according to David Kranzler, the movement and its relatives (e.g. the Gordonia youth movement) were relatively unsuccessful in accomplishing their goals in Europe, though they were popular.
Ideology.
Marxism.
While the Jewish Labour Bund was a trade union as well as a political party, its initial purpose was the organisation of the Jewish proletariat in Belarus, Russia, Poland and Lithuania. It was criticised however by individuals like Julius Martov and Vladimir Lenin for "Economism"; a claim rejected by Bundist leaders like Arkadi Kremer and Vladimir Medem. Many modern iterations of the Bund have divested from explicit Marxism but retain a public stance of advocating for socialism and/or social justice.
Secularism.
A staunchly secular party, the Jewish Labour Bund took part in kehillot elections in the Second Polish Republic. The Bundists reviled the religious Jews of the time; even going so far as to refer to Yeshiva students, who would live in poverty off charity and learn Torah instead of work, as "parasites." With the rise of Jewish secularism and the reduced political authority of religious institutions over Jewish life, some modern Bundist organizations do not consider this a primary focus.
Yiddishism.
The Jewish Labour Bund, while not initially interested in Yiddish "per se" as anything more than a vehicle to exhort the masses of Jewish workers in Eastern Europe, soon saw the language and the larger Yiddish culture as valuable and promoted the use of Yiddish as a Jewish national language in its own right; to some extent, the promotion of Yiddish was part and parcel of the Bund's opposition to the Zionist movement and its project of reviving Hebrew. This preference for Yiddish over Hebrew also had an aspect of class struggle: Hebrew (prior to its successful revival) was mostly spoken by educated Jewish men; Yiddish was a nearly universal language of Ashkenazi Jews. It was also promoted in opposition to the Russification policies of the Russian Empire; once again with a class element as upwardly-mobile, middle class Jews adopted Russian as their main language. With the decline of Yiddish as a spoken language, many Bundists now support the revitalisation of Yiddish as an explicit project (e.g., Bundist organisations in Australia sponsoring non-political Yiddish cultural centres for this purpose). 
Doikayt.
The concept of Doikayt (, from דאָ do 'here' plus ־יק -ik adjectival suffix plus ־קייט -kayt '-ness' suffix), is and was central to the Bundist ideology, expressing its focus on solving the challenges confronting Jews in the country in which they lived, versus the "thereness" of the Zionist movement, which posited the necessity of an independent Jewish polity in its ancestral homeland, i.e., the Land of Israel, to secure Jewish life. Today this often manifests in the form of Non-Zionism or Anti-Zionism and a focus on local politics.
National-cultural autonomism.
The Jewish Labour Bund did not advocate ethnic or religious separatism, but focused on culture, not a state or a place, as the glue of Jewish nationhood, within the context of a world of multi-cultural and multi-ethnic countries. In this the Bundists borrowed extensively from the Austro-Marxist concept of national personal autonomy; this approach alienated the Bolsheviks and Lenin, who was derisive of and politically opposed to Bundism.
In a 1904 text, "Social democracy and the national question", Vladimir Medem exposed his version of this concept:
"Let us consider the case of a country composed of several national groups, e.g. Poles, Lithuanians and Jews. Each national group would create a separate movement. All citizens belonging to a given national group would join a special organisation that would hold cultural assemblies in each region and a general cultural assembly for the whole country. The assemblies would be given financial powers of their own: either each national group would be entitled to raise taxes on its members, or the state would allocate a proportion of its overall budget to each of them. Every citizen of the state would belong to one of the national groups, but the question of which national movement to join would be a matter of personal choice and no authority would have any control over his decision. The national movements would be subject to the general legislation of the state, but in their own areas of responsibility they would be autonomous and none of them would have the right to interfere in the affairs of the others".
Opposition to Zionism.
Before the creation of the State of Israel.
The Jewish Labour Bund, as an organization, was formed at the same time as the World Zionist Organization. The Bund eventually came to strongly oppose Zionism, arguing that immigration to Palestine was a form of escapism. After the 1936 Warsaw kehilla elections, Henryk Ehrlich accused Zionist leaders Yitzhak Gruenbaum and Ze'ev Jabotinsky of being responsible for recent anti-Semitic agitation in Poland by their campaign urging Jewish emigration.
After 1947.
The Bund was against the UNGA vote on the partition of Palestine and reaffirmed its support for a country under the control of superpowers and the UN. The 1948 New York Second World Conference of the International Jewish Labor Bund condemned the proclamation of the Zionist state. The conference was in favour of a two nations’ state built on the base of national equality and democratic federalism.
A branch of the Jewish Labour Bund was created in Israel in 1951, the Arbeter-ring in Yisroel – Brith Haavoda, which even took part in the 1959 Knesset elections, with a very low electoral result. Its publication, Lebns Fregyn, remained in publication until June 2014. It was one of the last surviving left-wing Yiddish-language publications. The organisation dissolved in 2019, with its assets being transferred to the Zionist-Yiddishist organisation Beit Shalom Aleichem.
The 1955 Montreal 3rd World Conference of the International Jewish Labor Bund decided that the creation of the Jewish state was an important event in Jewish history that might play a positive role in Jewish life, but felt that a few necessary changes were needed. The conference participants demanded that:
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The World Coordinating Council of the Jewish Labour Bund was quietly disbanded by a number of Bundists and representatives of related organizations, including The Workers Circle and the Congress for Jewish Culture in the early 2000s.
Contemporary developments.
The Melbourne-based Jewish Labour Bund (founded in 1929) is considered the largest and most active existent organisation of the Bund. It organises a mix of events highlighting left-wing ideals (especially in Australia), concern for Jewish rights in Australia and abroad, and the preservation of Yiddish culture. It is the largest Non-Zionist Jewish organisation in Australia. The Melbourne Bund also maintains the only existing wing of the Bundist SKIF Youth Organisation. The Australian Bund today has ties to both the Australian Labor Party and Australian Greens, and has campaigned in favour of progressive social issues such as the rights of migrants, and in favour of a "Yes" vote in the Voice Referendum. It does not consider itself Anti-Zionist, and has not participated in either pro-Israel or pro-Palestine rallies in Australia.
The early 21st-century has witnessed a revival in the ideas of the Bund (sometimes called "neo-Bundism"). As such some new social movements have adopted the aesthetics and ideology of the Bund; often adding decolonial thought as an adaptation of Doikayt. One example of this is the Berlin-based Jewish Antifascist Bund (); an organisation of left-wing German Jews and Israeli immigrants that seeks to redefine the debate around Antisemitism in Germany away from support for Israel and posits that Antisemitism is "firmly anchored in the centre of German society". The organisation regularly takes part in Nakba Day demonstrations and positions itself as Anti-Zionist. In addition, as a result of their protests against the Israel-Hamas War a group of Jewish Students based out of Binghamton University formed the "New Yiddish Bund of Binghamton" in coordination with the Democratic Socialists of America in October 2023. The group published a manifesto in November of that year seeking to gain international support and cooperation, centreing Bundism as an alternative to Zionism within the modern Jewish diaspora. The group has drawn criticism from the aforementioned groups however, for its focus on Anti-Zionism and a lack of discussion of labour issues.
References.
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