In the Arab town of Majdal (Ashkelon today) was, before the 1948 war, a population of about 10,000. In October 1948, thousands of refugees from elsewhere in the country have been added for this population. In early November 1948 Majdal was occupied and the expulsion lasted until June 1950, when the remaining residents were deported to Gaza.
In the video, displaced people from Majdal and Zochrot members are visiting the remains of the Palestinian town and place signs which mention it's history. Somebody there really did not like one of the signs, and turmoil evolved around it.