Parliament of the United Kingdom, Malicious Communications Act 1988 (1988)
“ Offence of sending letters etc. with intent to cause distress or anxiety. 1.— (1) Any person who sends to another person— (a) a letter or other article which conveys— (i) a message which is indecent or grossly offensive; (ii) a threat; or (iii) information which is false and known or believed to be false by the sender ”
