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.