board of BLM.... she is on the board of directors for a nonprofit that sponsored the BLM Global Network Project from 2016 to 2020.
https://www.newsweek.com/fact-check-did-black-lives-matter-leader-bomb-us-capitol-1983-1568372
The Ruling
Partially True.
Susan Rosenberg, formerly a member of a left-wing terrorist group known as M19CO, did participate in the bombing of the U.S. Capitol's North Wing in 1983, for which she served a 16-year sentence. But she is not the head of the Black Lives Matter Global Network.
Rosenberg is on the board of directors for a nonprofit that sponsored the BLM Global Network Project from 2016 to 2020. While Berry acknowledged that in the context he provides, the meme he shared is misleading.