How does terrorism influence citizens’ willingness to deny basic liberties to domestic groups alleged to be “fellow travelers” of the perpetrators of terrorism? Based on intergroup threat theory and social identity theory, we hypothesize that political intolerance toward fellow traveler groups is determined by three factors: (1) the level of terrorism, (2) the degree to which domestic outgroups are alleged to be demographically or politically associated with terrorist groups, and (3) whether individuals identify strongly with the political Right. Consistent with our hypotheses, we find that higher levels of terrorism in Israel over a thirty-year period produce a “diffusion of political intolerance” among Israeli Jews on the Right that extends to domestic groups distant from the perpetrators of terrorism. Our findings have important implications for the study of terrorism, democracy, and political tolerance.

恐怖主义如何影响公民拒绝被指控为恐怖主义肇事者的“同路人”的国内团体的基本自由的意愿？基于群体间威胁理论和社会认同理论，我们假设对同行旅行者群体的政治不容忍由三个因素决定：（1）恐怖主义程度，（2）国内外群体被认为在人口或政治上相关的程度与恐怖组织，以及（3）个人是否强烈认同政治权利。与我们的假设一致，我们发现 30 年来以色列更高水平的恐怖主义在以色列右翼犹太人中产生了“政治不容忍的扩散”，并延伸到远离恐怖主义肇事者的国内团体。