More than 30 years later, Josh Fattal and Shane Bauer, both 28, are accused of spying.
They, along with 32-year-old Sarah Shourd, were arrested by border guards who say they entered Iran illegally.
Shourd was released last month.
The three friends say they were just hiking near a waterfall in a resort area in Iraq and if they crossed into Iran, it was unintentional.
Shane Bauer's sister lives in Boulder and says she just wants to see her brother again.
"I can't even explain how long it feels. Me and Shane and my sister Nicole are really close. And to not have him for more than a year of my life is crazy. And especially because in my opinion it's happening for no good reason at all," Shannon Bauer said.
The hikers' friends and families are holding fundraisers to help cover attorney costs, travel and publicity efforts in the U.S. and in Iran. For more information about their efforts, visit www.freethehikers.org.
(KUSA-TV © 2010 Multimedia Holdings Corporation)