Also, the 42 years ago part is interesting. 1979 Revolution is just 45 years ago. So I imagine this was part of some large purge that happened after the revolution.
Sure enough, wikipedia tells me of early 80s purging that includes Baha'i
The 1981 massacre[edit]
Between June 1981 and March 1982, the theocratic regime carried out the largest political massacre in Iranian history, targeting communists, socialists, social democrats, liberals, monarchists, moderate Islamists, and members of the Baha'i faith as part of the Iranian Cultural Revolution decreed by Khomeini on 14 June 1980 with the intent of "purifying" Iranian society of non-Islamic elements.[238] Between June 1981 and June 1982, Amnesty International documented 2,946 executions, with several thousand more killed in the next two years according to the anti-government guerilla People's Mujahedin of Iran.[239] More recently, Rastyad Collective has verified the identities of more than 3,400 political dissidents who were executed between June 1981 and March 1982.[240][241] These dissidents were sentenced to death by the Islamic Revolutionary Courts during show trials in more than eighty-five cities across the country on charges of spreading "corruption on Earth" (ifsad-fi-alarz), "espionage", "terrorism", or "enmity against Allah" (Moharebeh).[238] Most victims of the 1981 massacre were young activists aged eleven to twenty-four. These activists were either high school students or had recently graduated from universities in Iran and abroad. During the massacre, hundreds of minors were also subjected to arbitrary detention, torture, and summary executions on ideologically motivated charges of ifsad-fi-alarz and moharebeh by the revolutionary courts.[240][238][242]