I'm sure you've heard about it by now, but if not, yes it's true. Starhawk, American activist and a big supporter of peace has been denied entry and was deported from Israel.
News articles are saying she was there to teach a permaculture course in northern West Bank as well as working with other Earth Activists to develop another project in the Bethlehem area.
Of course, this is a pretty big deal as Palestinians need to learn how to feed themselves considering access to resources is pretty tight right now.
If you would like to read the entire article on Starhawk's entry denial and deportation, you can find it here Starhawk Denied Entry and Deported from Israel.