 Mossad provided a small operational unit, headed by future Israeli Prime Minister Yitzhak Shamir, but since it lacked an operational division at that time it mainly used units from the Shin Bet to carry out the attacks.Two Mossad agents, Joseph Ben-Gal, an Israeli, and Otto Joklik, Austrian, were arrested in Switzerland for threatening Heidi Goercke, daughter of a West German electronic guidance expert working at factory 333, Paul-Jens Goercke.They ordered her to persuade Goercke to return to Germany, threatening their safety if he did not comply.