Things got so bad that there were reports that first lady Melania Trump was unable to leave her hotel to attend an event.

The pictures out of Hamburg are wild. But in truth, it's par for the course. The G-20 has always attracted a rowdy crowd. As Julia Kulik, a researcher with the University of Toronto's Munk School of Global Affairs explained, the event draws a crowd of people opposed to “corporate greed.”

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“The G-20 was founded to make globalization for the benefit of all,” Kulik told Global News. But activists — many with an “anti-capitalist” bent — suggest that the summit isn't really “for the people.”

They point to the 2008 U.S. bank bailouts, the fact that most of the summit meetings are private and the lack of focus on the poor. “Seeing 20 to 21 people making decisions that affect the entire world is not appealing to a lot of people,” Kulik said.

In London in 2009, about 4,000 people gathered in the city's financial district before the meeting began. Relations between the activists and the police were tense throughout the conference — at one point, police charged a sit-in in the city center. There were at least 145 allegations of police brutality (one person collapsed and died after being knocked down; others said police hit them with batons), and several officers were reprimanded.

A similar scene met world leaders in Toronto in 2010. During that G-20 summit, there were protests throughout the city, leading to the largest mass arrest in Canadian history. At least 1,000 people were sent to detention centers, and a report later found widespread violation of protesters' civil rights.