The Globe says three of the attackers are from Mattapan section of Boston. Once a Jewish neighborhood, it was overrun by blacks in the 1960’s.
Good book on this topic; “Death of an American Jewish Community”. The Federal government created a program to help push unqualified people into owning homes. Local banks and real estate agents then used the program to start a block-busting operation in Mattapan. It worked beyond their wildest expectation; completely destroying a stable neighborhood.
As the sad joke goes... The real estate agents made money. The banks made money. Well, two out of there ain’t bad.
A few times I hung around Blue Hill Avenue up to 1966 eating at Delis and shooting pool. Then I went to war. I came back in 1968, and the Avenue was filled with burnt out stores once owned by Jews. Blacks were everywhere.
Straight out of Alinsky.