Mrs Maryam Rajavi may not enter the United Kingdom on the basis that her entry into the United Kingdom would not be conducive to the public good. The reasons are based principally on foreign policy and security grounds, not on fears about Mrs Rajavi's conduct here.
A judicial review of Mrs May's decision failed when heard in the High Court and that decision has been upheld in the Court of Appeal (Civil Division) - R (Lord Carlile of Berriew and others) v Secretary of State for Home Affairs  EWCA Civ 199 (Arden, Patten and McCombe LJJ). Mrs Rajavi is the leader of two groups in Iran opposed to the government there. She is the de facto
leader of the People's Mojahedin Organisation of Iran ("PMOI") and the
"President-elect" of the National Council for the Resistance of Iran
(NCRI) since 1993.
Mrs Rajavi has visited the United Kingdom on four previous occasions, without any consequences to British interests and the Secretary of State had no dispute with what Mrs Rajavi might say. Other member states of the EU have
admitted Mrs Rajavi and she has attended a dozen
meetings at the European Parliament, most recently in February 2012.
Mrs May made her decisions
on the recommendation of the Foreign Secretary and the Parliamentary
Under-Secretary of State at the Foreign and Commonwealth Office ("FCO").
They considered that, if the Secretary of State permitted Mrs Rajavi to
enter the United Kingdom for the desired purpose of speaking to members of Parliament, there will be not only
representations by the government of Iran and demonstrations, but also a
risk of unlawful reprisals. The present apprehended risk includes the
risk of damage to the British Embassy in Tehran and mistreatment of the
Embassy's local staff.
The right to freedom of expression (Article 10 of the European Convention on Human Rights) was seen as particularly important where those involved are
members of the legislature and the meeting was to be held in the Palace
of Westminster (or Houses of Parliament). 180 members of both Houses had indicated their
intention to attend, including former Secretaries of State and members
with expertise in foreign policy and security matters.
PMOI was a proscribed organisation under the Terrorism
Act 2000 from 29 March 2001 until 30 November 2007. On that date, the
Prescribed Organisations Appeals Commission ("POAC") allowed an appeal
against the Secretary of State's refusal to de-proscribe the
organisation. POAC found that there had been a significant change in
PMOI's activities dating from June 2001 onwards, and that PMOI could no
longer be said to be concerned with terrorism within the meaning of
section 3 of the Terrorism Act. The Secretary of State appealed to this
court. In 2008 the Court of Appeal upheld POAC's decision (see  EWCA Civ 443).
Lord Carlile of Berriew QC
Judgment in the High Court - Stanley Burnton LJ and Underhill J -  EWHC 617 (Admin)