Giving relief to Sajjan Kumar, a special Central Bureau of Investigation (CBI) court on Tuesday acquitted the Congress leader of all charges in a case connected to the 1984 anti-Sikh riots.
The other five accused in the case were found guilty on various charges.
The court convicted Balwan Khokkar, Girdhari Lal and Captain Bhagmal for murder and rioting.
Kishan Khokkar and Mahender Yadav were convicted for rioting.
The case is connected to the murder of five Sikhs in Delhi´s Cantonment area in 1984.
Protesters demonstrated outside the court after Kumar was acquitted of all charges.
A man, who was identified as Karnail Singh, hurled a shoe at the judge inside the court, reports said.
The police said Singh has been arrested.
The Delhi High Court on Monday deferred its verdict on the plea filed by Kumar against a trial court´s order charging him in the 1984 anti-Sikh riots case related to the killings of six persons in Sultanpuri.
The case has been deferred till May 15.
Besides the Kumar, accused Ved Prakash Pial alias Vedu Pradhan and Brahmanand Gupta had also moved the high court in connection with the case.
On July 2010, a lower court had framed charges against Kumar, Brahmanand Gupta, Peru, Khushal Singh and Ved Prakash in connection with the case.
The riots erupted in Delhi and elsewhere following the assassination of then Prime Minister Indira Gandhi on October 31, 1984.
Kumar and others were also charged for the offence of spreading enmity between two communities.