Dutch-Americans were persecuted, PELLA IOWA HISTORY: "The Hollander Fires - THE TWELVE"

"The Black Hand, a secretive anti-Dutch
group ( vigilantes? domestic terrorists? inept
young men? ) was behind several arson fires
at Dutch farms, a school, and one fire that
burned the Reformed Church in New
Sharon, Iowa to the ground. There was even
a bungling attempt to bomb a Reformed
parsonage..."

http://blog.perspectivesjournal.org/2016/01/12/the-hollander-fires