lemmygrad.ml and lemmy.ml are run by them, the former is explictly a tankie haven. While lemmy.ml is supposed to be a general lemmy instance, the admins (which are the same as lemmygrad's) have spoken in favor of genocide and removed posts on lemmy.ml that are critical of the CCP, especially in regards to the treatment of the Uyghurs.
Most instances have defederated lemmygrad, some have defederated lemmy.ml as well.