In the summer of 1975. Mr. Kosharovsky began a seminar for unemployed engineersengineers. who. like himself. were unemployed only because of their desire to live in Israel. For these activities. and for the simple act of having applied for the exit visa. Mr. Kosharovsky has been subjected to numerous threats of arrest and actual imprisonment for 15 days at a time on charges of hooliganism and disturbing the public order. The telephone has been disconnected. Books. cassettes. tape recordings and typewriters have been confiscated. Mr. Kosharovsky has been interrogated for his connection with Jewish activists and slandered in the newspapers as a traitor.