League for Socialist Reconstruction (LSR) was a DeLeonist

De Leonism

De Leonism, occasionally known as Marxism-Deleonism, is a form of syndicalist Marxism developed by Daniel De Leon. De Leon was an early leader of the first United States socialist political party, the Socialist Labor Party of America....

 political organization with sections in New York City

New York City

New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

 and Michigan

Michigan

Michigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....

. Joseph Brandon, Louis Lazarowitz, Sam Brandon and other LSR members had been active in the Industrial Union Party

Industrial Union Party

The Industrial Union Party was a US DeLeonist political party. The party proclaimed itself on 7 July 1933 at 1032 Prospect Avenue, Bronx, Branch headquarters of its predecessor Industrial Union League...

 after mass expulsion of the Socialist Labor Party

Socialist Labor Party of America

The Socialist Labor Party of America , established in 1876 as the Workingmen's Party, is the oldest socialist political party in the United States and the second oldest socialist party in the world. Originally known as the Workingmen's Party of America, the party changed its name in 1877 and has...

's Section Bronx during the 1920s. The LSR organ, The Socialist Republic, was published until 1980.

At a Unity Conference in Ypsilanti, Michigan

Ypsilanti, Michigan

Ypsilanti is a city in Washtenaw County in the U.S. state of Michigan. As of the 2000 census, the city population was 22,362. The city is bounded to the north by the Charter Township of Superior and on the west, south, and east by the Charter Township of Ypsilanti...

 from 22 August through 24 August 1980, LSR fused with the New Unionist group of Minneapolis to create the New Union Party

New Union Party

The New Union Party is a small political party in the United States. It was originally formed in 1974 as the New Unionists, several of whom had been members of Section Minneapolis of Socialist Labor Party of America . As with many such departures since the 1920s, they claimed SLP had become...

.