In the wake of its peace deal with Israel, the terrorist group Hamas is back on the streets of the Gaza Strip in an attempt, it says, to restore law and order, as well as to send a message.

In one video obtained by CBS News on Wednesday, Hamas fighters can be seen among armed men standing over Palestinians they accused of being gang members collaborating with Israel. Moments later, they execute them.

The disturbing images are part of a long pattern of punishment meted out to suspected collaborators, according to Israeli hostage negotiator Gershon Baskin.

"Hamas is killing them because they can," Baskin told CBS News. "Hamas is a criminal organization that has ruled the Palestinian people in Gaza for almost 20 years. This is not a democratic, liberal regime."

Baskin explains that Pa

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