UN rights experts also called for an 'independent and impartial investigation into allegations of torture' against the three facing sentences.
The rights group says it has evidence that 304 men, women and children were killed by Iran's security forces during the crackdown.
Iran's crackdown against prisoners protesting over COVID-19 safety concerns aims to prevent social uprisings, as public anger mounts.
Leaders of the grassroots protest movement say they are not ready to extend their support to Hizbullah-backed prime minister-designate Hassan Diab.
The latest round of sanctions targets three Lebanese businessmen who are accused of engaging in money laundering to support the party.
Security has been stepped up in the Lebanese capital following a night of violence involving Hizbullah and Amal supporters.
Supporters of Hizbullah and Amal tried to attack the main anti-government protest camp in central Beirut, in an attempt to undermine the largely peaceful protests.
The rights watchdog accuses the Iranian authorities of carrying out a 'vicious crackdown' following the outbreak of nationwide protests.
The regime's attempts to blame the popular uprising on foreign interference undermines the intelligence of the Iranian people.
Iranian actress Golshifteh Farahani says the Iranian people are 'suffering economically, politically and democratically'.