Last week’s Democratic convention was expertly choreographed for television. For the most part, the party exercised tight control over signage, especially as the week went on. There was MICHELLE on Monday, AMERICA on Tuesday, OBAMA on Wednesday, and HILLARY on Thursday, accompanied by a sea of flags, indoor fireworks, and a pre-rehearsed card stunt finale.

Those watching from home had to look hard to notice that some delegates — most of them supporters of Sen. Bernie Sanders — had brought in their own signs, many of them expressing opposition to the Trans-Pacific Partnership, a broad and controversial trade agreement. They did so against the wishes of Sanders himself, who urged his followers by email not to protest or demonstrate at the convention “as a personal courtesy to me.”

Most Sanders-pledged delegates obeyed, but not all. A significant minority participated in a walkout, chanted their own slogans, and battled with party loyalists to make their anti-TPP signs visible. Sanders opposed the TPP vehemently, saying that it was “designed to protect the interests of the largest multinational corporations.” Clinton, who praised the potential benefits of the TPP as secretary of state, has publicly expressed qualms about it as well. John Podesta, who chairs Clinton’s campaign, has said that she opposes a vote on the deal before the election and would seek “a new approach” as president.

On Thursday morning, the Arkansas Democratic Party refused to issue a daily floor credential to Frank Klein, an elected delegate from Arkansas. Klein had held up an anti-TPP sign during Obama’s speech the night before, as had delegates from Illinois, Florida, and elsewhere. But delegates from Arkansas, Bill Clinton’s home state, were seated in the front and near the center of the convention hall, making them especially visible to news photographers and TV cameras.

A video taken Thursday morning shows Klein engaging in a heated argument with state party officials. “I have the right to free speech,” Klein shouts in the video. “I am representing my people and what they want me to do, not what you want me to do.”