Many of its leaders were arrested and sent to concentration camps, and left the underground mostly leaderless.

Those who tried to avoid one of those options were arrested and sent to concentration camps.

Most of the teachers were soon arrested and taken away to numerous concentration camps, including school principal Piotr Feliks.

Many freethinkers and democrats were secretly arrested and taken to inland or foreign concentration camps without any judicial sentence.

Several of the houses were closed by the occupying forces, and many of the Brothers were arrested and sent to concentration camps.

Such dissidents were arrested and sent to concentration camps.

Others were arrested and sent to concentration camps.

Some Jews were beaten to death and more than 30,000 Jewish men were arrested and taken to concentration camps.