Rubuta ci gaba don wannan sakin layi - A lokacin Yakin Vietnam, zanga-zangar adawa da yaƙi a wasu lokuta ana kashe su ta hanyar amfani da sandunan billy da hayaki mai sa hawaye. Wani sanannen harin ya faru ne a lokacin Babban Taron Ƙasa na Jam'iyyar Democrat a watan Agusta 1968
a birnin Chicago. Wasu 'yan sandan 'yan tawaye sun cire alamun su, don guje wa ganewa, kuma sun yi wa masu zanga-zangar mummunan rauni. An kai wa 'yan jarida hari a cikin zauren taron. Daga baya aka bayyana ayyukan 'yan sanda a matsayin "ta'addancin' yan sanda" a cikin Rahoton Walker ga Hukumar Kasa ta Amurka kan Dalilai da Rigakafin Zalunci. A ranar 15 ga Mayu, 1969, 'yan sanda sun bude wuta a kan masu zanga-zangar a People's Park a Berkeley, California, wanda ya haifar da mummunan rauni ga wasu masu zanga-zangar. An bayyana kisan Kent State na 1970 na daliban jami'a 13 da National Guard suka yi a matsayin ƙarshen irin wannan tashin hankali.