Former narcotics officer Gerald Goines was charged with two counts of murder, while former partner Steven Bryant was charged with tampering with a government record.
He and his brother, Charles Koch, helped to build a massive conservative network of donors to support libertarian-leaning economic policies.
Sater's name appears dozens of times in former special counsel Robert Mueller's report on Russian interference.
"Everybody needs to be on alert," one doctor said.
The officer said he was fired after he requested a religious exemption from training a female deputy, conduct he believed to be "sinful."