Prime Minister Ariel Sharon is increasingly denounced as a traitor. Israeli government ministers are receiving death threats. Protesters have accosted senior politicians and yelled at them during public appearances. Far-right Israelis are growing increasingly strident in the months leading up to the planned withdrawal of Jewish settlers from the Gaza Strip this summer. Many Israelis are drawing parallels to the period of inflamed passions that preceded the 1995 assassination of Prime Minister Yitzhak Rabin, who was killed by a nationalist who rejected Mr. Rabin's concessions to the Palestinians. Mr. Sharon, a supporter of the settlers for decades, has been the...