What are the most deadly left-wing extremist attacks in the US since 2016?

Checked on September 22, 2025
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1. Summary of the results

The analyses provided do not offer a comprehensive list of the most deadly left-wing extremist attacks in the US since 2016 [1] [2] [3] [4] [5] [6]. However, left-wing extremist incidents have made up about 10% to 15% of incidents and less than 5% of fatalities [2]. Some sources mention examples of left-wing extremist groups, such as the Animal Liberation Front and Earth Liberation Front, which were involved in arson and vandalism campaigns in the 1990s and 2000s [2]. Additionally, anarchist/left-wing violent extremism is discussed in some sources, which highlight trends in violence committed by these groups, including locally organized and opportunistic violence [6].

  • Key points from the analyses include:
  • Lack of specific information about deadly left-wing extremist attacks in the US since 2016 [1] [3] [4] [5] [6]
  • Comparison of political violence by left-wing, right-wing, and Islamist extremists in the United States and worldwide [4]
  • History, ideology, and notable groups of left-wing terrorism, including the Weather Underground and the Symbionese Liberation Army [5]

2. Missing context/alternative viewpoints

Some sources note that assessing political violence in America is inherently subjective [3], and that the killing of Charlie Kirk is not representative of broader trends [3]. Additionally, right-wing extremist violence has been more frequent and deadly than left-wing violence in recent years [2]. The sources also highlight the importance of considering non-deadly left-wing extremist incidents, such as the Animal Liberation Front and Earth Liberation Front arson and vandalism campaigns in the 1990s and 2000s, and violence during Seattle May Day protests in 2016 [2].

  • Alternative viewpoints include:
  • FBI and DHS joint report findings that anarchist/left-wing violent extremists (AVEs) were among the extremist groups presenting the greatest threats of violence [6]
  • Trends in violence committed by AVEs, including locally organized and opportunistic violence, as well as interest in activities such as foreign fighter travel and terrorism financing [6]

3. Potential misinformation/bias in the original statement

The original statement may be misleading as it implies that left-wing extremist attacks are a significant threat, when in fact, right-wing extremist violence has been more frequent and deadly [2]. Additionally, the lack of specific information about deadly left-wing extremist attacks in the US since 2016 may be due to the fact that these incidents are relatively rare [1] [3] [4] [5] [6].

  • Potential biases include:
  • Overemphasis on left-wing extremism when right-wing extremism is a more significant threat [2]
  • Lack of context about the relative frequency and deadliness of left-wing versus right-wing extremist violence [2]
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