Israel Security Agency (ISA)

The Israel Security Agency (ISA), previously referred to as Shabak or Shin Bet, is responsible for preventing terrorism and all forms of subversion, whether by hostile enemy forces or by hostile forces within Jewish, Israeli society. 

The ISA is also responsible for all forms of counterespionage, both inside and outside of Israel. It is also responsible for the security of national information and for determining the reliability of those who deal with the country's classified information. It protects the country's most important individuals, especially the prime minister. Its role was extended after 1967, when Judea, Samaria and the Gaza Strip became Israel's responsibility and Arab terrorism increased both in Israel and abroad. The ISA head answers directly to the prime minister.