What is the fine-grained topic of the following text: Jessie Liu, a prosecutor in Washington, said the bank, the unnamed former employee and Mahmoud Reza Elyassi, an Iranian national and former bank customer in Dubai, "undermined the integrity of our financial system and harmed our national security by deliberately providing Iranians with coveted access to the U.S. Only return the topic.
Bank, former employee, and Iranian national undermining US financial system and national security by providing Iranians with access to US finances.