I didn't find much for Domenick.
Born: abt. 1878, Plati, Italy
Arrival: 14 Feb 1920, New York, New York aboard Taormina
Final Destination: Cambridge
Source: New York Passenger Lists 1820-1957.
Born: 24 Jan 1877, Plati, Provice of Reggio, Calabria, Italy
Residence: 305 Western St., Youngstown, OH
Spent 28 years in USA principally Butte, Silver Bow, MT.
Naturalized: Second Judicial Court of Montana, Oct. 6, 1900
Occupation: miner & laborer railway
Left USA May 1921 to visit parents in Italy where now residing. Desire to return to USA and reside there permanently. Application filled out American Consulate, Messina, Itary, 28 Nov. 1922.
Source: U.S. Passport Applications 1795-1925.
However I didn't find any information after that date.
Much better luck with Nicola.
I found the Nicholas Gunning family tree, trees.ancestry.com/tree/32748278/person/183232998132 which contains Nicola and his family. Most larger libraries provide free access to Ancestry.
Born: 27 Nov 1881, Italy
Residence: Wilmar, Wicomico, Maryland
Occupation: self-employed farmer, Ross, Wicomico, MD.
Nearest Relative: Ieropoli in MD - can't read rest of it
Source: World War I Draft Registration Cards 1917-18.
In 1920 the family was living in Parsons, Wicomico, Maryland.
Nicola Ieropoli, b. Italy, 38, laborer ship yard.
Irene, wife, b. Itally, 38.
Josephine, b. MD, 13.
Consie, dau, b. MD, 12.
Bruno, b. MD, 10.
Lucia, b. MD, 8.
Saveris, son, b. MD, 6.
Amelia, b. MD, 5.
Frankie, b. MD, 1 8/12ths.
Born: 27 Nov. 1881, Italy
Residence: Harting Highway, Richland, Atlantic Beach, NJ
Occupation: U. S. Dept. Interior, WA DC-C. C. C. Camp, Norma, Cu., NJ
Person who Will Always Know Your Address: Irene Ieropoli, same address as above.
Source: U.S. World War II Draft Registration Cards 1942.