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(Colorado News Connection) During last week's Republican National Convention, Senator Ted Cruz, R-Texas, said Americans are not safe due to immigrants committing violent crimes.

That's just one claim being challenged by leading immigration experts.

Nancy Foner, Ph.D., professor of Sociology at City University of New York's Hunter College, said labeling immigrants as criminals is an old, but persistent, myth.

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She pointed to data showing that the vast majority of immigrants are not violent criminals.

"The foreign born, in fact, are much less likely than the native-born to commit violent crimes," said Foner. "And in fact, cities and neighborhoods with greater concentrations of immigrants have much lower crime and violence than comparable non-immigrant neighborhoods."

Immigrants were also blamed for smuggling fentanyl across the 2,000-mile southern border.

But according to the U.S. Department of Homeland Security, 90 percent of the drugs linked to overdose deaths are smuggled by U.S. citizens through legal ports of entry.

Cruz also said immigrants were being allowed into the U.S. to vote in the upcoming elections - a conspiracy theory about something that never, or almost never, happens.

David Becker, executive director of the Center for Election Innovation & Research, pointed out that non-citizens are not legally allowed to vote in federal elections, and don't in part because they could be immediately deported if caught.

"To cast one ballot in an election in which 160 million ballots are going to be cast, it happens exceedingly rarely," said Becker, "largely because the states and federal government already have really good policies in place."

Others claimed immigrants were "receiving welfare."

Pia Orrenius, vice president and senior economist at the Federal Reserve Bank of Dallas, said immigrants are not eligible for the SNAP program (formerly known as food stamps), Social Security or other benefits - although they do pay payroll and other taxes that fund those programs.

She said immigrants actually strengthen America's economy, but local governments can feel squeezed if immigrants earn low wages.

"That negative impact, it mostly comes from education," said Orrenius. "K-12 education is expensive. The spending on education is an investment. Those investments are going to pay back many times what's invested."