A German Protestant clergyman, confined to a concentration camp in the Second World War, said of the Nazis:

First they came for the communists,
and I didn’t speak out because I wasn’t a communist.
Then they came for the socialists,
and I didn’t speak out because I wasn’t a socialist.
Then they came for the trade unionists,
and I didn’t speak out because I wasn’t a trade unionist.
Then they came for me,
and there was no one left to speak for me.