A group of more than 50 legislators representing 16 legislatures called Monday on HSBC Holdings Chairman Mark Tucker to unfreeze Hong Kong activist Ted Hui’s accounts.

Ted Hui is a former lawmaker from Hong Kong’s pro-democracy camp. In December, after announcing he was seeking asylum status in the UK, he said that he no longer had access to his Hong Kong bank account. Hui also currently faces criminal charges in Hong Kong related to previous democracy protests.

In the letter released Monday, the legislators called on multinational investment bank HSBC Holdings to unfreeze Hui’s accounts. This group includes legislators from Britain, Australia, Japan and the US. The group claimed, in response to accusations from Hong Kong police that Hui misappropriated funds and laundered money, that HSBC failed to give evidence of any court order or police warrant authorizing the action. They also claim that HSBC refused to publicly respond to concerns raised by Hui.

In addition to freezing Hui’s accounts, HSBC also froze bank accounts of a Hong Kong charity and a Christian church that supported the 2019 movement. The legislators wrote that HSBC’s actions “gravely tarnish HSBC’s reputation as a socially responsible enterprise operating under the rule of law,” and that its actions “undermine the open societies and free economies that underpin HSBC’s success.”

The letter closed by calling on HSBC to immediately unfreeze all HSBC accounts that belong to Ted Hui and his family. The letter also called on HSBC to formally explain the decisions to freeze the accounts,  and to “publicly commit to protecting the access to funds of individuals and their families subject to politically motivated charges issued by the Chinese and Hong Kong authorities.”