Actually, you have that backwards. Kamala Harris was giving groups money to bail them out of jail. The government hasn't made serious attempts to go after them. The FBI, idiotically, calls Antifa for example, "An idea." The US attorney's offices have let many of these violent rioters go without charges even when arrested.
The radical Left does enjoy broad support from government. There are plenty of radical Leftists serving in Congress. Name one that is an outright White Supremist and neo-Nazi on the other hand. On the radical Left we can start with those that are all for the New Green Deal. Or, those that want to defund police. Or, those that advocate for outright socialism and nationalizing many industries. Arizona's representative Raul Grijalva, openly admits he's a Marxist. Maxine Waters has called for a government takeover (Socialization) of the energy and oil industries.
You won't find many White Supremists or neo-Nazis in academia, if any at all, but you can bet your last dollar it's chock-a-block with Marxists, Maoists, Socialists, Feminists, minority racists, and a wide range of other ultra-radical Leftists. You can find radical Leftists in virtually any major newsroom in the US now.
There is no equivalent to that on the radical Right.
ANTIFA barely exists. It is a small impotent boogieman the right relies on to fire up the troops. They are only online with scant connections. They show no hierarchy and no leadership controlling them. The fact they they are Anti Fascist should make some Repubs agree with them. Many Repubs are pro-fascist though.
There are avowed White supremacists in politics. They are in congress and the senate. They are also in local politics. Antifa is nothing like that.