Socialist Majority Caucus
DSA's Socialist Majority Caucus signatories list as of April 25 2019 included Celeste Hornbach of New York City Democratic Socialists of America.
Endorsing Cynthia Nixon and Jumaane Williams
The Case for Endorsing Cynthia Nixon and Jumaane Williams (And How To Do It Strategically) was a letter Drafted by: Danya Lagos (CBK/Labor), and circulated among New York Democratic Socialists of America members in July 2018.
CoSigners, as of July 23 2018 were: Celeste Hornbach.
NYC DSA Car Caucus
Members of the New York City Democratic Socialists of America DSA Car Caucus closed Facebook group, as of October 26, 2017 included Celeste Hornbach.
Socialist Punk Caucus
Members of Democratic Socialists of America's Socialist Punk Caucus closed Facebook group, accessed November 24, 2017, included Celeste Hornbach.