remove_multi

 {
            "actionId": "1387105166864",
            "controlId": "1028921565360",
            "content": {
                "act": "remove_multi",
                "data": {
                    "to_uid": "4967597912087441843",
                    "from_uid": "2304613354852966840",
                    "grid_error_map": {
                        "6515581917459625000": 0
                    }
                },
                "act_type": "group"
            }
        }