<ul data-eligibleForWebStory="true">Actively deployed US Marines in LA to guard federal buildings during protests, alarming legal experts.Trump federalized 4,000 California national guardsmen for protest crackdown, sparking legal debate.Protests erupted in LA's Westlake area over aggressive ICE raids, resulting in clashes with law enforcement.Restrictions limit active-duty forces' actions in civil disturbances, prohibiting certain law enforcement activities.Military can assist police with information and expert advice in non-core functions.During emergencies, military commanders can act to prevent destruction without prior presidential approval.Enforcement of restrictions can vary in chaotic situations; Trump administration has sought to stretch legal limits.Marines have limited civil unrest training compared to National Guard; concerns rise over presidential authority.Constitutional experts warn against military crackdowns on civilians, fearing erosion of civil liberties.Deploying military against civilians blurs law enforcement-military distinctions, risking unchecked presidential power.