As a great fan of Alinsky, I loved the comment. We didn't organize when I was 13 but we did organize a strike when I was 14 and a pretty good demonstration when I was 16. In college, many of us picketed an appearance of George Wallace before he spoke and then went inside and listened politely to what he had to say, and departed unconvinced.
No way I can top your grandmother's comment!!! Was she, perhaps, related to Neville Longbottom's Gran?

Cheers

JohnT