Four Directions is targeting states with voter ID laws, like Wisconsin and North Dakota, as well as those with low Native American turnout, like Nevada.
Many states require election officials to compare a voter's signature with existing records before issuing and counting absentee ballots, but advocates are filing lawsuits to end the practice.
There are increasing reports of voter harassment in Dallas County as the hotly contested Senate race between Ted Cruz and Beto O'Rourke hurtles toward its culmination.