The effort unveiled Monday is particularly focused on making it easier for the U.S. to attract highly educated immigrants and those aiming to work in high-tech fields.

Silicon Valley leaders and others have long complained of the difficulties of bringing high-tech workers to the U.S., and immigration legislation taking shape on Capitol Hill is expected to address the issue.

The new effort, devised in part by New York Mayor Michael Bloomberg, aims to collect supporters and organize a time this spring for them to flood lawmakers’ offices via Twitter, Facebook, by phone and in person.