Something I've Wondered--Pro-life Grammar?

This is a very small thing and I am not trying to make fun of anyone by mentioning this, but I listen to EWTN radio or audiotaped TV pretty often and I sometimes hear something that I find grammatically odd. A fair number of people now use "pro-life" as a noun. They will say that someone "is working for pro-life", instead of saying that "So-and-so is doing pro-life work" or "So-and-so is a pro-life activist". Or they'll say things like "I try to talk to people about pro-life" or "She's involved in pro-life." Why not "I try to talk to people about pro-life philosophy/thought/concerns" or "She's involved in pro-life work." I don't understand why people would word things this way; it just does not sound like common usage. And how widespread is this? I accept Catholic teaching on life issues, but I am not involved in the pro-life political movement, so I don't know if this is something common to the movement as a whole or just something certain EWTN listeners/viewers use. It's not something that is keeping me up nights, but if anyone has an idea of what's going on here, I wouldn't mind hearing about it.