The Federal Bureau of Investigation (FBI) is indeed known to assist other federal agencies, such as the Department of Homeland Security (DHS) and Immigration and Customs Enforcement (ICE), in various operations. However, the specific information about 30 arrests across Louisiana in immigration enforcement operations is not something that would be universally known without a reference to a particular event or news article. It appears that you might be sharing information from a recent or ongoing operation.

Immigration enforcement is a federal responsibility, and ICE, as part of DHS, is primarily tasked with enforcing U.S. immigration laws and investigating immigration-related crimes. The FBI's role in such operations typically involves providing support and resources, as well as collaborating on cases where federal laws have been violated. These operations are often conducted in a coordinated effort to maintain public safety and national security, while also upholding the integrity of the immigration system.

It is important to note that the FBI operates within the constraints of the law and the U.S. Constitution, which includes respecting individual rights and civil liberties. If you have any concerns about a particular operation or the legality of such actions, it is best to refer to official government sources or consult legal professionals. The FBI's official website or the local FBI field office may provide more information about their involvement in such matters, as well as the laws and policies that guide their operations.