Martin Niemöller

Known for his often-quoted 'prose' - "First they came..." Which has many variants, but are based on his original:

In Germany they first came for the Communists,
and I didn't speak up because I wasn't a Communist.
Then they came for the Jews,
and I didn't speak up because I wasn't a Jew.
Then they came for the trade unionists,
and I didn't speak up because I wasn't a trade unionist.
Then they came for the Catholics,
and I didn't speak up because I was a Protestant.
Then they came for me -
and by that time no one was left to speak up.

http://www.hoboes.com/html/FireBlade/Politics/niemoller.shtml