bk613,
“what legal right does Hatzolah have to confiscate private property from them”
The article did not state that Hatzolah confiscated the radios. I assume it was the parents, and they definitely have the right. Note the appeal from the Hatzola Catskills coordinator:
“We are pleading with parents to confiscate ALL radios with Hatzolah frequencies from children, and imploring parents not to buy these devices for them. This is Pikuach Nefashos, and this will not be tolerated whatsoever”, a Catskills Hatzalah Coordinator told YWN.”