Found this list compiled by Trevor Noah back in 2019. I don't think it is complete however.
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I’ve been asked to compile a list of socialists and communists in Congress. A friend of mine was challenged to name “even two socialists in Congress”. Altogether, if you add in Islamist connections I think about 100 members of the House of Representatives would struggle to pass a low-level background security check. But guess what? There are no security checks in Congress.
Here’s my list of 50 of the most obvious socialists in the House, with links to my website
Keywiki for the backup evidence. Apologies to the many I’ve omitted. please email me at trevor.newzeal @gmail.com if you’d like to be included in future lists.
Raul Grijalva (
D AZ) Has worked closely with the Communist Party USA since at least 1993. A self-described “Alinskyite.” Travelled to Cuba in 2015.
Ami Bera (
D CA) Has used Communist Party USA campaign volunteers in 2010, 2014 and 2016. Also close to Democratic Socialists of America.
Nancy Pelosi (
D CA) Very close to several key Communist Party USA allies in San Francisco in the 1970s and ’80s. Also some involvement with Democratic Socialists of America.
Barbara Lee (
D CA) Lee has been close to the Communist Party USA for decades. In the 1990s she was a leading member of the Communist Party spin-off Committees of Correspondence. Has been to Cuba more than 20 times.
Ro Khanna (
D CA) Very close to Democratic Socialists of America.
Salud Carbajal (
D CA) Long history with Democratic Socialists of America members.
Judy Chu (
D CA) Was heavily involved with the now defunct pro-Beijing Communist Workers Party in the 1970s and ’80s. Still works closely with former members today. China’s best friend in the US Congress.
Raul Ruiz (
D CA) Worked closly with Workers World Party members in Massachusetts in the late 1990s.
Karen Bass (
D CA) Was actively involved with the Marxist-Leninist group. Line of March in the 1980s. Still works closely with former members. Mentored by a leading Communist Party USA member. Also close to Democratic Socialists of America and someFreedom Road Socialist Organization members. Has been to Cuba at least 4 times.
Maxine Waters (
D CA) Long history with the Communist Party USA. Also ties to some Communist Workers Party and Workers World Party fronts. Has employed staff members from Democratic Socialists of America and League of Revolutionary Struggle.
Joe Courtney (
D CT) Has worked closely with several Communist Party USA leaders.
Rosa DeLauro (
D CT) Has worked extremely closely with the Communist Party USA for many years. Travelled to Cuba in 2014.
Jim Himes (
D CT) His 1988 thesis “The Sandinista Defense Committees and the Transformation of Political Culture in Nicaragua” was a sympathetic portrayal of Marxist government’s civilian spy network. Has worked closely with one Communist Party USA front group.
Kathy Castor (
D FL) Has worked closely with Cuba and pro-Castro organizations to open US trade with the communist island.
John Lewis (
D GA) Worked closly with the Communist Party USA and Socialist Party USA in the 1960s. In recent years has worked with Democratic Socialists of America members.
Tulsi Gabbard (
D HI) Has worked with Democratic Socialists of America members through her political career. Ties to some Filipino-American “former communists”. Worked with Communist Party USA affiliated former Congressman Dennis Kucinich to defend Soviet-Russian puppet Syrian leader Bashar-al-Assad.
Bobby Rush (
D IL) Former leader of the Maoist leaning Black Panther Party. Has worked closely with Communist Party USA and Democratic Socialists of America. Has travelled to Cuba twice.
Jesus “Chuy” Garcia (
D IL) hs worked closely with the Communist Party USA for nearly 40 years.
Danny Davis (
D IL) Was a member of Democratic Socialists of America in the mid 2000s. Has worked closely with the Communist Party USA since the 1980s. Also close to Committees of Correspondence in the 1990s.
Jan Schakowsky (
D IL) Was a member of Democratic Socialists of America in the 1980s and has continued to work closely with the organization. Has also worked closely with some Communist Party USA members.
Dave Loebsack (
D IA) has worked closely with Socialist Party USA and
Democratic Socialists of America members for many years.
John Yarmuth (
D KY) has worked with Committees of Correspondence for Democracy and Socialism members. Travelled to Cuba in 2011.
Jamie Raskin (
D MD) has worked closly with Democratic Socialists of America for many years.
Jim McGovern (
D MA) has supported Latin American socialist and revolutionary groups for 20 years. has travelled to Cuba at least three times.
Ayanna Pressley (
D MA) Has been endorsed by Democratic Socialists of America. Worked with Freedom Road Socialist Organization front groups and with the pro-Beijing Chinese Progressive Association in Boston.
Andy Levin (
D MI) Close to Democratic Socialists of America for at least a decade.
Rashida Tlaib (
D MI) Democratic Socialists of America member.
Betty McCollum (
D MN) Close ties to communist Laos. Has worked with Democratic Socialists of America members. Traveled to Cuba in 2014.
Ilhan Omar (
D MN) Supported by Democratic Socialists of America controlled groups Our Revolution and National Nurses United. Reportedly a self-described “democratic socialist”.
Bennie Thompson (
D MS) Was close to the Communist Party USA for many years. Also supported one Communist Workers Party organization. Travelled to Cuba in 2000 and worked with Fidel Castro to train leftist American medical students in Cuba.
William Lacy Clay (
D MO) Has worked with Communist Party USA fronts for many years.
Greg Meeks (
D NY) Has travelled to Cuba at least 3 times. Was a strong supporter of Venezuelan dictator Hugo Chavez.
Grace Meng (
D NY) Very close to the pro-Beijing Asian Americans for Equality. Was also active in a radical Korean-American organization.