They came first for the communists,I'm a red, which explains why free speech matters so much to me. If capitalists don't respect free speech, I'm silenced.
and I didn't speak up because I wasn't a communist.
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 Jews,
and I didn't speak up because I wasn't a Jew.
Then they came for me
and by that time no one was left to speak up.
But that quote isn't addressed to reds. It's addressed to people who oppose them. A modern equivalent for antiracism theorists would start, "They came first for the bigots, and I didn't speak up because I wasn't a bigot."
Censors love a foothold, so they start with the things that the majority opposes, then use what they've gained to censor more. That's why I agree with the ACLU: lovers of free speech must speak up for a bigot's right to speak.
ETA: I wouldn't have thought of the quote if I hadn't seen it being used by one of the supporters of Wiscon's decision to cancel a speaker. The notion that Niemöller believed in silencing bad people before their ideas could spread just croggled me.
Yes, many notions croggle me.
ETA 2: This post follows from uninviting a speaker is censorship: Elizabeth Moon, Wiscon, ACLU, and more.