This is the only source I found when searching:
https://israelfaqs.com/docs/who-is-jacob-berger-and-why-do-many-say-hes-not-what-he-pretends-to-be/
Not gonna trust that for obvious reasons. Context matters. If this dude is raping people you should include the fucking context. Otherwise it just appears that you are helping push isntreal propaganda against flotilla activists.