FISA Statutes 50 USC Chapter 36
50 USC CHAPTER 36, SUBCHAPTER I: ELECTRONIC SURVEILLANCE
https://uscode.house.gov/view.xhtml?path=/prelim@title50/chapter36/subchapter1&edition=prelim
§1801. Definitions
(i) "United States person" means a citizen of the United States, an alien lawfully admitted for permanent residence (as defined in section 1101(a)(20) of title 8), an unincorporated association a substantial number of members of which are citizens of the United States or aliens lawfully admitted for permanent residence, or a corporation which is incorporated in the United States, but does not include a corporation or an association which is a foreign power, as defined in subsection (a)(1), (2), or (3).
§1802. Electronic surveillance authorization without court order; certification by Attorney General;
(a)(1) Notwithstanding any other law, the President, through the Attorney General, may authorize electronic surveillance without a court order under this subchapter to acquire foreign intelligence information for periods of up to one year if the Attorney General certifies in writing under oath that—
(A) the electronic surveillance is solely directed at—
(i) the acquisition of the contents of communications transmitted by means of communications used exclusively between or among foreign powers, as defined in section 1801(a)(1), (2), or (3) of this title; or
(ii) the acquisition of technical intelligence, other than the spoken communications of individuals, from property or premises under the open and exclusive control of a foreign power, as defined in section 1801(a)(1), (2), or (3) of this title;
(B) there is no substantial likelihood that the surveillance will acquire the contents of any communication to which a United States person is a party; and
(C) the proposed minimization procedures with respect to such surveillance meet the definition of minimization procedures under section 1801(h) of this title; and…
§1801(i) and §1801(a)(2)(B) specify that a United States person is not a party to the conversation.
A FISA surveillance that knowingly includes US persons should be a violation of the law.
Names of Trump family members were likely masked to hide the illegal surveillance and unmasked to leak to the media, despite no crime by the citizens. The crime was committed by the FBI.