AAN, Archiw Akt Novykh—Archive of Modern [Historical] Documents
ADAV, Allgemeiner Deutscher Arbeiterverein—General Union of German Workers
Bund, General Jewish Workers’ Union of Lithuania, Poland, and Russia
FVdG, Freier Verband der deutschen Gewerkschaften—Free Association of German Trade Unions
IAA, Internationale Arbeiter-Assoziation—the International Workingmen’s Association, or First International
ISB, International Socialist Bureau
KPD, Kommunistische Partei Deutschlands—Communist Party of Germany
LSDP, Lietuvos Socialdemokratų Partija—Social Democratic Party of Lithuania
PPS, Polska Partia Socjalistyczna—Polish Socialist Party
PPS-L, Polska Partia Socjalistyczna-Lewica—Polish Socialist Party-Left
PPS-ZP, Polska Partia Socjalistyczna Zaboru Pruskiego—Polish Socialist Party in Prussia
PPSD, Polska Partia Socjalno-Demokratyczna Galicji i Śląska—Polish Social Democratic Party of Galicia and Silesia
RGASPI, Russkii Gosudarstvennyi Arkiv Sotsialno-Politcheskoi Istorii—Russian State Archive for Social and Political History
RSDRP, Rossiyskaya Sotsial-Demokraticheskaya Rabochaya Partiya—Russian Social Democratic Labor Party
SDAP, Sozialdemokratische Arbeiterpartei—Social Democratic Workers’ Party
SDKP, Socjaldemokracja Królestwa Polskiego—Social Democracy of the Kingdom of Poland
SDKPiL, Socjaldemokracja Królestwa Polskiego i Litwy—Social Democracy of the Kingdom of Poland and Lithuania
SPD, Sozialdemokratische Partei Deutschlands—Social Democratic Party of Germany
SR, Sotsialisty Revolyutsionery—Socialist Revolutionary Party
USPD, Unabhängige Sozialdemokratische Partei Deutschlands—Independent Social Democratic Party of Germany
ZRP, Związek Robotników Polskich—Union of Polish Workers
ZZSP, Związek Zagraniczny Socjalistów Polskich—Union of Polish Socialists Abroad