See the article: US withholding Fisa court orders on NSA bulk collection of Americans' data - Justice Department refuses to turn over 'certain other' documents in ACLU lawsuit meant to shed light on surveillance practices
See the article: US withholding Fisa court orders on NSA bulk collection of Americans’ data – Justice Department refuses to turn over ‘certain other’ documents in ACLU lawsuit meant to shed light on surveillance practices (Guardian)
And see: Letter to ACLU (pdf)
Also: Human Rights Watch calls for legislation against surveillance (DW, link)