Printed ephemera, including some periodicals. Most items concern various political and revolutionary groups, such as the Russian Social Democratic Labour Party (RSDRP), the Party of Socialist-Revolutionaries (PSR), the Jewish socialist Bund, the Polish Socialist Party, and the Anarchist-Communists. The materilas reflect the activities of the groups and organizations and include flyers, leaflets, calls for actions, invitations, event announcements, newsletters, appeals, articles, bulletins, etc.