Ferguson, MO (KTRS)  Two protesters arrested in Ferguson during last year’s civil unrest are challenging the St. Louis County ordinance cited in their arrest, calling it too vague.

The Reverend Melissa Bennett and KB Frazier filed suit against the county, county counselor Peter Krane and Missouri Attorney General Chris Koster. They claim the ordinance violates their 14th Amendment rights and should be tossed out.

Both were among many protesters cited for interfering with police, but the suit says the ordinance does not adequately define what constitutes interference.

County officials say the ordinance does not violate free speech but simply requires that some order be maintained.

Ferguson was the site of protests after 18-year-old Michael Brown, who was black and unarmed, was fatally shot by officer Darren Wilson. The shooting sparked the national Black Lives Matter movement.