American | American Civil War | United States House of Representatives | American Broadcasting Company | American football | White House | African American | House of Lords | American Idol | American Revolutionary War | American Revolution | House of Representatives | House | House of Commons of the United Kingdom | American Association for the Advancement of Science | American Red Cross | Royal Opera House | Massachusetts House of Representatives | Advisory Committee on Antarctic Names | American Library Association | International Olympic Committee | American Museum of Natural History | Florida House of Representatives | American Express | Committee of Public Safety | American Academy of Arts and Sciences | UK Antarctic Place-Names Committee | American League | American Association | American Heart Association |
He is best remembered as the namesake of the legislature's Canwell Committee to investigate communist influence in Washington state, patterned after the House Committee on Un-American Activities (HUAC) of the United States Congress.
After the war, under pressure from the paranoid Committee on Un-American Activities, the JSA disbanded.
He was accused of being a communist by Donald L. Jackson and went before the U.S. House of Representatives Committee on Un-American Activities.
Married to the actress Karen Morley, both were brought before the House Un-American Activities Committee and when they invoked the Fifth Amendment they were blacklisted, effectively terminating their careers in Hollywood until the late 1960s.
He was subpoenaed by HUAC after John Garfield mentioned during his testimony that Kaplan was a friend of his.
In 1955, SSIS published a list of what it described as the 82 most active and typical sponsors of communist fronts in the United States; some of those named had literally dozens of affiliations with groups that had either been cited as Communist fronts or had been labelled "subversive" by either the subcommittee or the House Committee on Un-American Activities.