Prosecutors took a hard line Thursday with demonstrators who participated in a rare disruption inside the U.S. Supreme Court, adding additional charges against them and saying disrupting the high court is different from other protests in the nation's capital.

The demonstrators, five women and two men, were arrested last month after standing in succession inside the court and shouting protests against the court's 2010 Citizens United campaign finance ruling. Each person stood and spoke after the court's justices took the bench but before oral arguments began on Jan. 21, the fifth anniversary of the court's Citizens United decision. The decision freed corporations and labor unions to spend unlimited amounts on Congressional and presidential elections.

On Thursday, prosecutors added two additional misdemeanor charges against the seven demonstrators. The group behind the demonstration, 99Rise, was also responsible for a similar demonstration last year in which the group's co-founder Kai Newkirk was arrested. Newkirk's protest was the first to disrupt an argument session in more than seven years.

The disruptions made news not only because they were rare but because the group managed to take videos of both events and post them on their website, despite the fact that the Supreme Court does not allow cameras inside the courtroom. Spectators, lawyers and reporters have to pass through a metal detector before entering the Supreme Court chamber, and police examine the things spectators are bringing into court.