"Linked to the International Solidarity Movement" means that they went along to a memorial service for Rachel Corrie.

Calling that a "link" implies something very different from that. It's a smear tactic.

Here is a link to a story which indicates what "the link" actually consisted of - "C4 cameraman killed in Gaza"   The headline refers to the shooting of a British television camerman by an Israeli tank as he was filming demolitions of homes. (I wonder if there are any plans to bulldoze the home where the bomber's family lived? Since he came from Derby that might be a bit tricky.)

Out of the limelight, over the last few days, those killed by Israeli forces have included a two year old child, as well as a fair number of pre-adolescents. No doubt the people responsible for those killings have have been to memorial services in their time. That's a "link"?