From www.ourstoryisone.bic.org:

On 18 June 1983 — 40 years ago this month — 10 Baháʼí women were taken to a square in Shiraz, Iran, under the cloak of night. After months of torture and imprisonment, they were mass executed without the knowledge of their families. One was 17, most in their 20s. Their crime was their belief in a faith that promoted gender equality — absent and criminalized in Iran — justice and truthfulness. They were hanged one by one, each forced to watch the next woman’s death in a harrowing attempt to coerce them into renouncing their faith. None did.

Read more here.