why do you think it should be illegal for the US Attorney's office to file a civil suit against the owners of a property that appears to be instrumental

why do you think it should be illegal for the US Attorney's office to file a civil suit against the owners of a property that appears to be instrumental in the narcotics and vice trade of a whole township? How does the US Attorney get standing here? All other issues aside, shouldn't it be the MA Attorney General suing?