"Al Gore is giving his acceptance speech right now; are we going to accept that?" one speaker asked the crowd, getting a loud "NO!" in response.
"Is Al Gore the candidate of the people?" he asked, again getting a boisterous "NO!" in answer.
When Gore concluded his speech to wild applause inside, the activists outside ratcheted up their noise level as well, banging on pots and pans, blowing whistles and chanting slogans. Darkness then fell, and the group lit candles for a vigil in honor of the causes they had championed during the convention week.
Several small protests were conducted earlier in the day, with the largest rally held in the downtown garment district to protest sweatshops and call for better wages and health benefits for garment workers.
The protesters, many of them Hispanic, sang and danced in the street to spread their message that immigrants are too often the victims of unfair labor practices. The other demonstrations Thursday included:
In front of the downtown federal building, 200 protesters demanded an end to U.S. Navy bombing exercises on the Puerto Rican island of Vieques.
At Pershing Square, 100 activists mounted a "Spank the Bank" protest, criticizing Citibank for funding projects that they alleged were ruining the environment.
In Century City, where Gore was staying, there was more chanting of "Save it, don't pave it," as activists called for protection of wetlands.
Los Angeles police said their heavy presence was necessary to provide safety and security during the convention. But leaders of some of the protests outside the convention hall said the police had been antagonistic.
Some among the network of protesters said the Los Angeles Police Department -- the lead agency among several law enforcement organizations here -- used the event to repair a scandal-tarnished image after a year of bad press.
The department is under investigation over allegations of excessive force and corruption in its Rampart Division, which polices a largely poor, Hispanic section of the city. More than 70 current and former officers are under investigation, and five are scheduled to stand trial on conspiracy charges next month.
"We are really worried that the LAPD has really seen this week somehow as a week of redemption," said Margaret Prescod, of the Direct Action Network, which helped to coordinate demonstrations on behalf of causes ranging from opposition to free trade, to support for animal rights and abolition of the death penalty.
'I got shot in Los Angeles'
Even those protests sanctioned by the city were met by legions of heavily armed police in riot gear.
On Wednesday, a sound technician working for CNN suffered bruised ribs during a demonstration outside the Staples Center when police struck bystanders with batons. LAPD Commander David Kalish apologized for the incident, but said "this kind of thing sometimes happens" when reporters and technicians work their way into a crowd of demonstrators.
"There's simply just so many media people integrated into the crowds, and it is unfortunate we had this situation, and again we apologize," Kalish said.
After receiving a formal complaint from Tom Johnson, chairman, president and CEO of CNN's News Group, Police Chief Bernard Parks turned the incident over to the police department's Internal Affairs division, Kalish said, adding, "They'll conduct a thorough investigation."
On Monday night, police shut down an authorized concert by the politically oriented band Rage Against the Machine and moved against the crowd on horseback, using rubber bullets.
Senior LAPD officers called it a "measured" and appropriate response, but those caught up in the action say it was anything but. Some said they were shot in the back, and representatives of some news organizations say police attacked them despite equipment and credentials identifying them as nonparticipants.
Photographer Al Crespo said he was hit by a rubber bullet fired by police at close range.
"There's clear time on both sides to recognize who we are, who the police are and who the press is. And you know, we are supposed to have a white flag," Crespo said.
"I was in Kosovo last year, you know, and I didn't get shot there. I got shot in Los Angeles."
The American Civil Liberties Union has said it will file a lawsuit against the LAPD on the behalf of Crespo on Friday.
Nearly 200 arrested in protests
Police have arrested more than 195 people in three days of protests on charges ranging from misdemeanors such as failing to disperse and reckless driving -- on bicycles. But authorities have brought 59 felony counts, largely conspiracy and resisting arrest.
On Tuesday, Kalish said police seized "improvised weapons" from about 45 demonstrators arrested outside a fur shop near downtown's Pershing Square. Police said the protesters planned to use the devices -- slingshots, aerosol cans and lighter fluid that he said could have been used as crude flame-throwers -- against area businesses such as a McDonald's and a fur store.
Wednesday, however, a march on the Rampart Division headquarters took place peacefully. Demonstrators and police consulted with each other and with the U.S. Justice Department's Community Relations Service to plan the event, which resulted in the arrests of 38 demonstrators.
CNN National Correspondent Martin Savidge and The Associated Press contributed to this report.