Asia Internet Coalition, a Singapore-based lobby group says its members may leave Hong Kong if a new doxxing laws comes into force.
AIC members include tech giants Facebook, Google and Apple.
The group worry that legislation could make them criminally liable.
Doxxing is when people publish private details about online personalities. It can be as simple as identifying the real name of someone using a pseudonym.
It could also refer to revealing addresses, phone numbers or other details used to trace and identify people.
In recent years people have weaponised the practice in Hong Kong to the point where there are thousands of victims.
People have used doxxing to scare activists off pro-democracy protests. On the other side, protestors have revealed the names of police or court officials who acted against protestors. It has also been used against journalists.
When private details are published people may find themselves on the wrong end of threatening calls or other intimidating behaviour. Sometimes this includes attacks on family members. Doxxing can lead to identity theft.
Hong Kong’s courts have found the effects can be severe and long-lasting.
The proposed privacy law amendments aim to outlaw doxxing and force social media companies and websites to take down personal information.
The Hong Kong government proposes to change the existing data privacy legislation to include doxxing acts committed with the “intent to cause psychological harm”.
A conviction would be punishable by up to five years in prison and a fine of HK$1 million.
As things stand, Hong Kong’s officials can make employees of social media or other websites criminally liable.
The AIC objects to the definition of doxxing used in the proposed law. It also worries services like Facebook and Twitter might face liabilities when doxxing happens on their services.
In a letter, the AIC says the only way tech companies could avoid punishment would be by withdrawing their services from Hong Kong and ceasing to invest in the territory. It is not clear whether these companies make significant investments in Hong Kong.