Why do grassroots employees of the Industrial and Commercial Bank of China have to report to their units for overseas travel? Will they be fired if they do not declare?

This is a regulation to prevent official corruption and crime. All banks have similar requirements. Failure to declare may not necessarily lead to expulsion, but if found out, a round of criticism within the industry will be inevitable.

It’s just a matter of declaration. As far as I know, some banks also stipulate a certain level. Even personal passports must be handed over to the bank for safekeeping. If you want to travel abroad personally, you need to apply in advance before you can get it back.