What were the most deadly incidents of left-wing violence in the US since 1990?

Checked on September 20, 2025
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1. Summary of the results

The analyses provided do not offer a comprehensive list of the most deadly incidents of left-wing violence in the US since 1990 [1]. However, they do provide some context and statistics on left-wing extremist incidents. According to one source, left-wing terrorists have murdered 65 people, or about 2 percent of the total number of people murdered in politically motivated terrorist attacks in the US since 1975 [1]. Another source states that left-wing extremist incidents have made up about 10% to 15% of incidents and less than 5% of fatalities, citing examples such as the Animal Liberation Front and Earth Liberation Front arson and vandalism campaigns in the 1990s and 2000s [2]. Some sources suggest that right-wing extremist violence is more frequent and deadly than left-wing violence in the US, providing examples of deadly right-wing extremist attacks [2]. Key points to note are the lack of specific examples of deadly left-wing extremist incidents since 1990 and the varying statistics on the frequency and deadliness of left-wing violence.

2. Missing context/alternative viewpoints

Several sources mention the difficulty in assessing political violence in America, as it requires determining which forms of violence count as political and assigning ideological labels to attackers or victims [3]. Some analyses highlight the rise of violent far-left extremism in the US, but do not provide specific examples of deadly incidents since 1990 [4]. Others discuss domestic terrorism incidents in the US, but do not provide information on left-wing extremist incidents [5]. Alternative viewpoints include the consideration of the historical context of left-wing violence in the US, such as the Weather Underground movement and the Black Liberation Army, which carried out attacks in the 1970s [4]. Additionally, some sources mention the decentralized, leftist movement Antifa, which opposes far-right, racist, and fascist groups, but do not provide specific information about deadly incidents [6]. Key missing context includes the specific examples of deadly left-wing extremist incidents since 1990 and a more detailed analysis of the historical context of left-wing violence in the US. Some possible reasons for the lack of information on left-wing violence include:

  • The difficulty in defining and tracking left-wing extremist incidents
  • The potential for underreporting or misclassification of left-wing violence
  • The focus of many sources on right-wing extremist violence, which may be more frequent and deadly

3. Potential misinformation/bias in the original statement

The original statement asks for the most deadly incidents of left-wing violence in the US since 1990, but the analyses provided do not offer a clear answer to this question [1]. Some sources may be biased towards highlighting the threat of right-wing extremist violence, which could lead to an underemphasis on left-wing violence [2]. The lack of specific examples of deadly left-wing extremist incidents since 1990 may be due to a lack of data or a focus on other types of violence. Additionally, some sources may be influenced by political agendas or ideologies, which could impact their analysis of left-wing violence [7]. Those who may benefit from this framing include politicians and activists who seek to highlight the threat of right-wing extremism, as well as those who wish to downplay the significance of left-wing violence. Key points to consider when evaluating the potential misinformation or bias in the original statement include:

  • The sources' potential biases and agendas
  • The lack of specific examples of deadly left-wing extremist incidents since 1990
  • The historical context of left-wing violence in the US
  • The difficulty in defining and tracking left-wing extremist incidents [3]
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