There are laws against discrimination for things like skin color, religion, ethnicity, and lately sexual orientation and sexual identity.
But those laws do not stop discrimination on political grounds..................
Regarding communications systems, laws against discriminating on the basis of creed should be universal, and viciously enforced.
There is little more threatening to the nation than denial of public speech on what are defacto public platforms.
I don't give a D@mn who owns the wires. The public owns the forum.