[2][3][4] It is a major funding source for the anti-immigration movement in the United States, supporting several organizations designated as hate groups by the Southern Poverty Law Center (SPLC).

[2][4] The foundation has stated that their mission is "to promote sustainable immigration that won’t overwhelm the environment or the economy".

[5] When May died in 2005, she left close to half of her fortune to the Colcom Foundation, which totaled over $400 million.

[10][11][12] Several of the groups funded by the Colcom Foundation have been designated as hate groups by the Southern Poverty Law Center (SPLC), including the Center for Immigration Studies (CIS), and the Federation for American Immigration Reform (FAIR).

[13][14][15] In 2020, immigrant rights activists launched a campaign to discourage Pittsburgh-area civic and environmental groups from accepting money from the Colcom Foundation.