He（主语）// participated in（谓语动词）// rallies（宾语）// where placards portrayed Rabin as a Nazi and in the sights of a gun（修饰宾语定语从句）.

关系副词where=in which引导定语从句，定语从句结构为“地点状语+主语+谓语动词+宾语+宾补1+并列连词and+宾语2”

where（地点状语）// placards（主语）// portrayed（谓语动词）// Rabin（宾语）// as a Nazi（宾补1） //and（并列连词）// in the sights of a gun（宾补2）

(1)portray vt.描绘；描画；描写;将…描写成；给人以某种印象；表现（英文解释：to describe or show sb/sth in a particular way, especially when this does not give a complete or accurate impression of what they are like）

portray sb/sth as sth把某人/某物描写成某种样子

Throughout the trial, he portrayed himself as the victim. 

在审讯过程中，他始终把自己说成是受害者。

Romantic artists portrayed nature as wild and powerful. 

浪漫主义艺术家描绘的大自然是狂野而强大的。

The President likes to portray himself as a friend of working people. 

总统喜欢以工薪阶层的朋友自居。

(2)in the sights of a gun 在枪口的视线范围

(3)in the sights of 在..的视线范围内

They will take in the sights of the city tomorrow.  

他们明天将要游览这个城市的名胜.

Juventus goalkeeper Gigi Buffon is in the sights of Chelsea owner Roman Abramovich.  

尤文门将布冯进入切尔西老板阿布的视野.