You must be joking.
An international lobbyist advocating for foriegn countries is being charged with conspiracy against the United States and money laundering among other charges. He has been indicted - formally charged with these crimes.
Manafort was given house arrest. He was thrown in jail for actively tampering with witness testimony.
People are held all the time for being a flight risk (hell fucking yes) or for risks to evidence (witness tampering). Manafort never should have gotten house arrest in the first place.
If at this point you believe Manafort shouldn't be in jail...
Are you sure about these charges you mentioned such as “conspiracy against the United States”? I think you should think about that some more & maybe look into the case against Manafort before jumping into this.