Zoom suspended an account used to host a meeting commemorating the Tiananmen Square massacre between pro-democracy activists and Chinese dissidents.
The suspension targeted Humanitarian China, an organisation based in the US, after it held a call with roughly 250 people, including a number who dialled in from China.
The organisation is led by Zhou Fengsuo who was a student leader during the protests for political reform in the country which concluded with a brutal military crackdown on 4 June 1989.'Survivors still afraid to speak out'
The event was held so that those who were present at the protests as well as the families of those were were killed could share their stories and remember those who had died.
Zoom, which does not protect its video calls with end-to-end encryption, is accessible within China without a VPN.
The company said: "Just like any global company, we must comply with applicable laws in the jurisdictions where we operate.
"When a meeting is held across different countries, the participants within those countries are required to comply with their respective local laws."
Zoom did not explain which laws those on the call were suspected of violating.
Humanitarian China's account was subsequently reinstated.
While there are no specific laws in China which forbid commemorating the Tiananmen Square massacre, those who do so have often been accused by the government of inciting subversion.
Hackers linked to the Chinese government have been tied to cyber attacks targeting human rights activists in and around the country's borders as part of Beijing's strict approach to dissent.
Official figures, which are likely understated, report that around 300 people died while 7,000 were wounded in the massacre. Some estimates put the death toll at more than 1,000 people.
Last year Twitter was forced to apologise for suspending accounts which criticised the Chinese government on the eve of the 30th anniversary of the protests.