Jamshid Sharmahd's execution 'is the cruel end of a process that can only be described as a show trial,' Amnesty's Germany chapter said.
The regime's attempt to cover up the massacre of Afghan refugees in mid October has provoked a angry reaction from Iranian citizens.
More than 200 Afghan migrants were gunned down while trying to cross the border.
The US, UK, Australia, Canada and New Zealand have pledged to act in 'lockstep' to hold the Iranian regime accountable for human rights violations.
Iran's proxies in Yemen have broadcast forced confessions to spread disinformation about detained international and local NGO staff.
More than two dozen mariners taken hostage during the Houthis' hijacking of the Galaxy Leader remain in the group's custody in Yemen.
At least 19 Iranian Bahais were detained last week in two Iranian cities during a new crackdown on the minority group. Most remain imprisoned.
The 'Women, Life, Freedom' movement has succeeded in changing Iranian society, says Iranian-French researcher Fariba Adelkhah.
Since the war began, regime-linked media have been flooded with Gaza news and anti-Israel rhetoric, drowning out a number of domestic events that are troubling for the country's rulers.
US President Joe Biden and other world leaders have emphasized the need to protect civilians in Gaza and increase humanitarian aid.