Up to 250,000 people marched through Berlin last Saturday against the proposed Transatlantic Trade and Investment Partnership (TTIP).
It was Germany’s biggest demonstration since protests against the Iraq war in 2003.
TTIP is a planned treaty to create the world’s biggest free trade area, involving the European Union (EU) and the US.
It could give bosses more powers by overturning regulations on safety, workers’ rights and the environment.
Unions, opposition parties and campaign groups called the protest.
Other anti-TTIP events took place around Europe on Saturday.
Shadow chancellor John McDonnell addressed a hundreds-strong rally in central London’s Conway Hall.