[1][2][3][4] January 1946 national group: Other sources: The ICCASP started in 1944, as an "Independent Voters Committee of the Arts and Sciences for Roosevelt" (IVCASR).

From the start, the group found itself at odds with the Truman administration's "aggressive anti-Soviet" and anti-labor policies, as well as his accommodation to racism.

In November 1945, scientist Linus Pauling spoke to the group on atomic weapons; shortly after, his wife Ava Helen and he accepted membership.

[2] In late 1945, the ICCASP's Hollywood chapter ("HICCASP") published a scathing critique of Dies Committee chairman, entitled Introducing... Representative John E.

[18] Fellow actors, mostly Roosevelt supporters, like Olivia de Havilland, Bette Davis, Gregory Peck and Humphrey Bogart were also in its Hollywood chapter.

When reform efforts failed, a number of prominent members from the liberal side like De Havilland and Ronald Reagan left in 1946, causing the ICCASP to be seen increasingly as a Communist front group.

[22] The ICCASP's position on nuclear arms, plus Republican victories in the 1946 mid-term elections, led members like Ickes to resign "because of perceived Communist domination of the organization.

Shapley accused HUAC of "Gestapo methods" and advocated for its abolition for making "civic cowards of many citizens" by pursuing the "bogey of political radicalism.

[2] In 1948, the ICCASP and National Citizens PAC merged and supported former US Vice President Henry A. Wallace as presidential candidate for the Progressive Party (United States, 1948).