Google publishes eight secret data requests from the FBI

In a post today, Google published a series of eight National Security Letters, in which the Federal Bureau of Investigation secretly requested subscriber information on specific accounts. The letters range from 2010 to 2015, but follow a nearly identical format, identifying a number of accounts and sometimes a specific time frame but providing no evidence or suspicion to justify the request.
Google was legally prohibited from disclosing the requests when they were first issued, but that prohibit