Multiple sides, actually.
Here's Jamaal Bowman, recently elected Democrat from Brooklyn, getting his mic cut by CNN the other night for criticizing Rahm Emmanuel:
Here's Jamaal Bowman, recently elected Democrat from Brooklyn, getting his mic cut by CNN the other night for criticizing Rahm Emmanuel:
So if they are trying to secretly cover them up (as you seem to imply), they are doing a bad job.
For a less ambiguous case, look at how CNN and MSNBC treated the Bernie campaign/movement. Calling them "MSM" doesn't mean that one is a reactionary, it just means that one is outside of their set of approved viewpoints in any direction.