With the increasing level of armed conflict in this 3-way fight, it seems practical to try and limit direct confrontations.
Say you want to stop a far-Right caravan from entering a city, you could always shutdown the highways before the fighting gets to the city center.
The most common tactic used by piqueteros was to
arrive on a road, highway or city intersection, and block it with
tires. Small fires were often built in the middle of the road, and if necessary the tires themselves were set on fire, often by inserting a few plastic bags doused with gasoline into each tire's rim and igniting them. The burning plastic bag would quickly ignite the rubber on the tire.
In one case, a hasty blockade established by piqueteros
consisted of the unravelling of a chain link fence
and extending it across a roadway, where it was
secured to a telephone pole.
The piqueteros, a movement based in
community and family groups, would also have
a self-defence force at their blockades, usually
masked people armed with batons. The batons
became one of the symbols of the movement.
These groups would defend the blockade against
any vigilante actions by motorists as well as assaults by small numbers of police. Piquetero
blockades often lasted until police had mobilized
a large enough force that threatened the blockade, at which point they dispersed.