That’s how I lost my job. I went for her in front of a meeting of her crazy followers —they all had to be Obliviated. It was a big scandal.
-- Porpentina Goldstein (WFT)
American No-Maj group seeking to expose and destroy witches and wizards in the 1920s led by the extremist Mary Lou Barebone, a descendant of Scourers, and her three adopted children. Their meeting place was the “dingy” New Salem Church in New York City where they ran a soup kitchen for poor children to whom they distributed anti-magic pamphlets (WFT).
Porpentina Goldstein lost her job as an Auror after stopping Mary Lou Barebone from whipping her son Credence with a belt. The followers who saw Tina use magic had to be obliviated, and her actions were considered a breach of the Statute of Secrecy and Rappaport’s Law dividing wizards and No-Majs (WFT).
According to the article Entertainment Weekly: Fantastic Beasts: 6 Surprising Things We Learned on the Set, a character named Mary Lou heads the "Second Salemers" group, which is driving magical folk underground in New York City.