QUOTE: Since the USA Freedom Act was passed in 2015 – as a response to the backlash from the Snowden revelations – FISC has been forced to publish statistical information annually, but the ACLU has pointed out that any review of FISC behind-closed-doors decisions is solely "conducted ... by executive branch officials, not a court."
Rather than worry about "what they know about you", a person might be more concerned with "what you DO NOT know about them".
In the US, the Constitution requires that "No Money shall be drawn from the Treasury, but in Consequence of Appropriations made by Law; and a regular Statement and Account of the Receipts and Expenditures of all public Money shall be published from time to time." But then, the above mentioned Executive Branch, in the "Statement of Federal Financial Accounting Standards 56", October 4, 2018, addressing federal financial reporting, with measured words, provides that: "omitting or misstating information about the item makes it probable that the judgment of a reasonable person relying on the information would have been changed or influenced by the omission or the misstatement.", even though these very same acts of fraudulent financial reporting are also criminal acts under 18 U.S. Code § 1001.
To put this intentional US government fraudulent financial reporting into context, consider that, between 1998 and 2016, DOD and HUD balance statements included $21 Trillion in Unsupported Journal Voucher Adjustments. Over the following 3 years, 2017, 2018, and 2019, Bloomberg reports an additional $94 Trillion in DOD accounting adjustments. So, roughly, $115 *Trillion* in "accounting adjustments" over two decades. For perspective, the entire US National Debt is less than $30 Trillion. And this is only the amount actually reported in their own financial statements.
The analysis of this Missing Money by "debunkers" is amusing, where they argue that there is no "missing money" but only some misleading instances of replicated accounting transactions, due to an antiquated government accounting system - I suppose, in the same way that Bank Robbery is not really a criminal activity, but is merely a mischaracterization of an "unauthorized withdrawal".
All the while, in the midst of over $100 Trillion in "fuzzy accounting", publicly, the US Congress bickers over the cost of Child Care and a national Health Care system. Follow these links to see the DOD Financial Statements and read the entertaining disclaimers by the auditors: