List of Members of the Squad
Wikipedia Article gives members asfollows
The founder members were, and they were employed full time and received a weekly wage.
Paddy Daly (leader),
Mick McDonnell,
Ben Barrett,
James Conroy,
Sean Doyle,
Joe Leonard,
Pat McCrae,
Jim Slattery
Bill Stapleton.
Further members seem also to have included
Mick Love,
Gearoid O'Sullivan,
Patrick Caldwell,
Charlie Dalton,
Mick O'Reilly,
Vincent Byrne,
Sean Healy,
James Ronan,
Tom Keogh
Tom Cullen.
Seán Lemass
Stephen Behan (the father of Irish writers Brendan Behan and Dominic Behan)
Dr. Andy Cooney is also reported to have been associated with "The Squad".
The best known of the Squad's operations was the assassination of 12 British officers on 21 November 1920 (some of whom were spies, some of who were mistaken identity). The Black and Tans responded the next day by machine gunning the crowd and killing 12 (the number is coincidental) innocent civilians at Croke Park Gaelic Football Match.
In view of the whole background it is not surprising that much has remained unspoken about individual's involvements over the years. With nobody wanting to claim "responsibility" in many instances.
Your best bet is to peruse the Irish National Archives for the statements from members of the Squad that are available.
You can get a photo of Vinny Byrne by
querying Google with ""Vinny Byrne" squad"