Actually, it's more like 76.
The edited video the idiots have been passing around:
The unclipped version:
As you see, "names have been named."
The Democratic Socialists of America, as of 2009, claimed 70 members in Congress. Names are named.
Until 2002, the DSA hosted the website of the Progressive Caucus.
If there is any significant difference in economic and foreign policy ideas between the published positions of the Congressional Progressive Caucus (or the Citizen Agenda, come to that) and a self-identified Communist, I have yet to see it.