Two other leaders of the Jamaat-e-Islami have been sentenced to death by the tribunal.
Jamaat is an ally of the BNP, which is led by former Prime Minister Khaleda Zia.
His family and friends blamed Jamaat-e-Islami, the country's largest Islamist party, for the killing.
The issue has united Islamist parties, which have often had political and ideological differences with Jamaat-e-Islami.
Last month, former Jamaat leader Abul Kalam Azad was sentenced to death in absentia.
BBC: Huge Bangladesh rally seeks death penalty for war crimes
Earlier this month the tribunal charged Ghulam Azam, the former leader of Jamaat-e-Islami, with war crimes.
Senior Jamaat leader Shafiqul Islam called on the government "to stop harassing our party leaders".
BBC: Bangladesh strike over war crimes trials sparks clashes
Last week, a special tribunal sentenced a former member of Jamaat-e-Islami to death in absentia.
BBC: Bangladesh strike over war crimes trials sparks clashes
In Bangladesh the fortunes of the Islamist Jamaat-e-Islami party plummeted in last December's election.
Senior Jamaat-e-Islami leader Delwar Hossain Sayeedi was convicted of murder, abduction, rape and torture, and sentenced to death.
On hearing the verdict, anti-Jamaat protesters who had gathered at a busy intersection in the city erupted into cheers.
Haider's family and friends suspect Jamaat-e-Islami in the attack, but the Islamic party issued a statement Saturday denying involvement.
He leads Jamaat al Muslimeen, a group of mainly Afro-Trinidadian converts to Islam.
The recent violence is mainly blamed on the opposition Jamaat-e-Islami party, whose leaders are facing war crimes at the tribunal.
The tribunal is trying a total of nine Jamaat leaders and two members of the opposition Bangladesh Nationalist Party (BNP).
To some that lack of accountability was reflected in the fact two members of Jamaat have served as Cabinet ministers.
The Jamaat-e-Islami wants the trial of its leaders for crimes allegedly committed during the 1971 independence war to be stopped.
BBC: Dhaka police and protesters clash over war crime trials
Those charged include a number of senior Jamaat leaders and a former minister from the opposition Bangladesh Nationalist Party (BNP).
The ordeal proved embarrassing for Usman Sharif, a candidate for the hard-line religious Jamaat-e-Islami party, in the southern city of Karachi.
Jamaat-e-Islami was a key partner in the former government of Khaleda Zia, a longtime political rival of Prime Minister Sheikh Hasina.
Despite the evidence presented in the book, neither MOA nor Jamaat al-Fuqra is currently designated by the U.S. as a terrorist organization.
CENTERFORSECURITYPOLICY: twilight in america expand even more
Jamaat had also called for demonstrations in the capital Dhaka after Friday prayers but authorities responded by deploying a heavy security presence.
Liaqat Baloch, secretary general of Pakistan's most popular Islamic party, Jamaat-e-Islami, said members of his party were strongly considering boycotting the elections.
Eight of the 10 suspects indicted by the war-crimes tribunal are from Jamaat-e-Islami, an ally of the main opposition Bangladesh Nationalist Party.
Abdul Kader Mullah, 64, the assistant secretary general of the Jamaat-e-Islami, was found guilty of five out of six charges, including murder.
Jamaat rejects the tribunal and staged a strike on Thursday in protest.
Observers now expect the verdicts in the cases of senior Jamaat-e-Islami leaders such as Mr Sayeedi and Mr Azam to follow rapidly.
Yet another competitor is an Islamic revivalist movement, Tablighi Jamaat, rooted in south Asia but active in Africa and Europe, especially Britain.
Pearl, 38, was abducted last week while on his way to interview the head of the fundamentalist Islamic Jamaat ul-Fuqra group in Karachi.
Reports say Pakistani police have also ordered the sealing of some offices used by Jamaat-ud-Dawa, the Islamic charity seen as a front for Lashkar-e-Taiba.
应用推荐