I think the charges are based on the action of duping people into casting invalid votes rather than his speech, if I understood the article I read correctly-- charged under civil rights conspiracy statute:
- Section 241 of Title 18 is the civil rights conspiracy statute. Section 241 makes it unlawful for two or more persons to agree together to injure, threaten, or intimidate a person in any state, territory or district in the free exercise or enjoyment of any right or privilege secured to him/her by the Constitution or the laws of the Unites States, (or because of his/her having exercised the same). Unlike most conspiracy statutes, Section 241 does not require that one of the conspirators commit an overt act prior to the conspiracy becoming a crime.
The offense is punishable by a range of imprisonment up to a life term or the death penalty, depending upon the circumstances of the crime, and the resulting injury, if any.
TITLE 18, U.S.C., SECTION 241
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If two or more persons conspire to injure, oppress, threaten, or intimidate any person in any State, Territory, Commonwealth, Possession, or District in the free exercise or enjoyment of any right or privilege secured to him by the Constitution or laws of the United States, or because of his having so exercised the same;...
They shall be fined under this title or imprisoned not more than ten years, or both; and if death results from the acts committed in violation of this section or if such acts include kidnapping or an attempt to kidnap, aggravated sexual abuse or an attempt to commit aggravated sexual abuse, or an attempt to kill, they shall be fined under this title or imprisoned for any term of years or for life, or both, or may be sentenced to death.
