The migrant advocacy group ProAsyl said it helped the group file a complaint Monday with the Council of Europe's Court of Human Rights.
Karl Kopp of the Frankfurt, Germany-based group said today that the asylum seekers were from Syria, Iraq and Afghanistan. He did not disclose their names.
"They know they will probably not see justice but if there is a (favorable) verdict, then it might help refugees in the future," Kopp told The Associated Press.
The migrants had been stranded at the sprawling tent city of Idomeni on the Greek side of the border.
The expulsions signaled a shift across much of Europe toward a tougher line against refugees after more than a million had crossed into the European Union the previous year.
In hectic scenes seen on television internationally, Greek and overseas volunteers helped the migrants across a river with many holding young children and their belongings over their heads.
"We have not forgotten what happened. Our point is that violence was used and people were pushed back illegally. There were handicapped people there and others who were clearly in need of assistance."
Macedonia, which used its army to build a razor-wire fence along the border with Greece, has argued that it has the right to protect its borders and denies using excessive force.
The legal complaint was also supported by the European Center for Constitutional and Human Rights, also based in Germany.
The camp at Idomeni was dismantled by Greek authorities in May, and its inhabitants were bused to army-built shelters.
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