Prosecutors increased the number of charges to 12 against Simpson, Clarence Stewart, Michael McClinton and Charles Ehrlich.
Conviction on felony coercion carries a sentence of up to six years in prison.
The four men didn't have to appear before the judge. They were represented by their lawyers.
The revised complaint drops charges against Walter Alexander and Charles Cashmore, who pleaded guilty to reduced charges and are due to testify against the others at a preliminary hearing beginning Nov. 8.
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