They publish a journal called "Towards Marxist-Leninist Unity". In the July 2019 issue of it, they wrote extensively about "transgender ideology" and "transgenderism". They also wrote, at length, about how trans women do or are responsible for the following:

1. How trans women are rapists
   
2. How trans women force cis women to look at "hard erections" in sports locker rooms
   
3. How trans women colonize women's spaces
   
4. How trans women have unfair advantages in women's sports
   
5. How trans women are eliminating women's spaces
   
6. How trans women undo cis women's progress
   
7. How trans rights are funded by the CIA
   

They also say that Workers World Party, the Party of Communists USA, and other organizations are bad for supporting trans rights.

Here is the journal issue in which they state all this:

http://redstarpublishers.org/TMLUv1n2.pdf

Edit: The best part is that - despite all sociological and academic research - they claim all of us are upper class white men and that working class and black and brown people aren't trans.