That, of course, is referring to incidents of the infamous "Saison" operation of the Palmah and Hagana against mainly the Irgun dissidents. Some were beaten and tortured by the representatives of the "official Yishuv" institutions, others were interrogated and incarcerated and others handed over to the British CID. Some where kicked out of schools.
The official Palmach site isn't working. So go to Yehuda Lapidot's site on the matter.
But in any case, I though they were reference the Irgun kidnappings of British soldiers. An also other officials as Judge Windham as reported in the Palestine Post on January 28, 1947:
In any case, three young teenagers are not soldiers nor official Israel state representatives.