Britain First leaders Paul Golding and Jayda Fransen have been charged with causing religiously aggravated harassment.
The trial involved three Muslim men and a teenager who have since been convicted of rape.
Golding and Fransen, both from Penge in south-east London, were arrested on May 10.
Last month, Shershah Muslimyar, 21, of Hovenden Close, Canterbury, restaurant owner Tamin Rahmani, 38, of Northwood Road, Ramsgate and Rafiullah Hamidy, 24, formerly of High Street, Herne Bay, were each jailed for 14 years, and an unnamed 17-year-old was locked up for seven.
The investigation related to the distribution of leaflets in the Thanet and Canterbury areas, and the posting of online videos during a trial held at Canterbury Crown Court the same month.
Ms Fransen has been charged with four counts of causing religiously aggravated harassment.
Both were bailed to appear at Medway magistrates in Kent on October 17.
The former leader of the English Defence League (EDL) was given a suspended prison sentence for contempt of court in May after filming outside the court during the same rape trial.