Picketers see that they are losing their power, their plans, the possibility of managing the management units, the cooperatives, and they try to conserve something. Emilio Pérsico, from the Evita Movement, is perhaps the best (or worst) example of the system.
The other two references mentioned are Juan Grabois and Eduardo Belliboni. The first, with greater political intentions, has under its wing the UTEP that promoted several of the main current protests, such as "hunger row"