Martin Niemöllers zweite Frau (seit 1971), Sibylle von Sell schreibt dazu am 23.4.2000 in h-holocaust https://www.h-net.org/~holoweb/ :.“ The trouble with Martin Niemoeller’s „famous quotation“ is that he never wrote it down – which enabled so many hitchhikers over the years to „put themselves on the waggon“. In his „Confession of Guilt“ (as he called it himself: Schuldbekenntnis in German) the Communists came first, then the Trade Unionists and then the Socialists and then the Jews. NO ONE ELSE.”
Pretty dystopic that you post this quote, because it is doctored to include catholics. Niemöller’s wife explicitly stated that he never included them in his poem. Source: https://martin-niemoeller-stiftung.de/martin-niemoeller/was-sagte-niemoeller-wirklich