Google has filed a lawsuit in response to the Consumer Financial Protection Bureau's decision to place its payment arm under federal supervision.This supervision would subject Google to inspections for potential violations of the law, similar to major banks and financial institutions.The CFPB cited complaints about Google's handling of erroneous transactions and failure to prevent fraud as reasons for the supervision.Google argues that the CFPB's decision is based on a small number of unsubstantiated complaints and claims it is a case of government overreach.