Observers say Perella is friends with many of the ex-executives who make up the dissident group.
Meanwhile, members of Cuba's most prominent dissident group, the Ladies in White, said that 22 of their members had been detained.
Angered when their recommendations were overruled, and just months after quietly filing their whistleblower suit, the dissident group took the matter into their own hands.
His detention was protested at the time by a Saudi dissident group known as the Committee for the Defense of Legitimate Rights, according to U.S. officials.
On Thursday, the dissident group, which includes former Morgan Stanley president Robert Scott, published a second letter addressed to the board asking for the "immediate removal" of Purcell.
But the board has stood firmly beside its chairman and CEO and appears to be offering the Discover sale as a bone to make the dissident group go away.
The latter dissident group was behind a bomb which exploded outside the Army base which houses MI5's Northern Ireland headquarters in 2010 and was responsible for recent grenade attacks on police.
Leaders of the dissident group had been reluctant to move to the new camp because of the conditions there, calling it more of a prison than a home when they first arrived.
He and a separate dissident group, led by ex-NYSE director Kenneth Langone , have blasted the merger's financial terms, which split the value of the combined company into 70% for NYSE holders and 30% for Archipelago.
Members of the Ladies in White, a dissident group, had said they planned to attend the Mass, but none were seen by a reporter at a rendezvous point on Wednesday morning, and it appeared that their cellphones weren't operating.
Police in Northern Ireland discovered a 600-pound bomb in County Armagh, which was thought to be the work of a dissident republican group.
The attack at the Army barracks, which was claimed by the dissident republican group the Real IRA, was carried out in March 2009.
The failed attack was claimed by the Continuity IRA, a dissident republican group made up from breakaway members of the IRA opposed to the Good Friday Agreement peace accord.
The attack came 24 hours after a dissident republican group, Oglaigh na hEireann, claimed responsibility for planting a pipe bomb at a community centre on the Shore Road in north Belfast.
BBC: Pipe bomb thrown at police in Belfast 'reckless bid to kill'
Jamal Ahmed al-Fadl said he told US officials that the Saudi dissident's group was trying to "make war" against the United States and would make bombs against "some embassy".
He has received overtures from a group of dissident Peronists around Mr Duhalde, who became Mr Kirchner's most powerful foe.
Such changes had been demanded by a group of eight dissident shareholders, led by former Morgan Stanley President Robert Scott.
In recent months, Chairman and Chief Executive Philip Purcell has waged a public battle with a group of eight dissident shareholders who are calling for his head, claiming his mismanagement is to blame for the company's lackluster performance.
In February charges were laid against Nguyen Van Ly, a dissident priest who founded Block 8406, a new and apparently widely supported group which last year issued a manifesto for democracy.
Warnings have gone too to another dissident, Leonel Morejon, a leading figure in the Cuban Council, a group that raised its head some years ago to the point of being soundly smacked down when it tried to meet publicly in February 1994.
He would not be drawn on which group he thought was responsible, however he said there had been a number of dissident republican threats in the Omagh area recently.
In his desire to bring dissident Catholics back into the mainstream Church, Pope Benedict has been negotiating with a traditionalist Catholic Group based in Switzerland, known as the Society of Saint Pius X, which roundly rejects the reforms of Vatican II.
The group, formed after a week of talks in Doha, will have two vice-presidents - prominent dissident Riad Seif and leading secular activist Suhair al-Atassi.
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