Federal prosecutors on Friday moved to drop charges against the last 39 people accused of participating in a violent protest on the day of President Donald Trump's inauguration.

The motion to dismiss charges by the U.S. attorney's office seemingly ends an 18-month saga that started with the Justice Department attempting to convict more than 190 people.

That effort saw the government facing off against an intensely coordinated grassroots political opposition network that made Washington the focus of a nationwide support campaign — offering free lodging for defendants, legal coordination and other support.