Yes, “Illegal Aliens” is the correct term.   An alien registration card is the official legal language for permanent visa and legal immigration status.    If an immigrant does not possess an alien registration card, or legal citizenship status, they are an “illegal alien”.
CALIFORNIASTAN – More than 100 people pelted U.S. Border Patrol agents with rocks and bottles during a rowdy confrontation Sunday afternoon along the U.S.-Mexico border, federal authorities said.

Nobody was seriously injured and it’s not clear whether the crowd was trying to enter the U.S. illegally or hold a demonstration, but the sight of a large crowd surging beyond the border rattled nerves.
Agents said it harked to the days in the 1990s when migrants would run across the border en masse, in so-called banzai runs that would overwhelm agents. As the crowd on Sunday crossed the Tijuana River into California, more than one dozen agents responded to the border fence atop the levee and deployed pepper spray to hold them back, triggering the melee.
Several agents were hit in the arms and legs with rocks and one agent was hit in the head with a filled water bottle, officials said. The crowd eventually dispersed.
“It was extremely unusual,” said agent Timothy Hamill, an agency spokesman. “It was dangerous, very dangerous.”
Demonstrations along the border are not uncommon and protesters have at times briefly crossed the border in symbolic displays of defiance. The confrontation Sunday occurred along one of the most heavily fortified spots on the border just west of the San Ysidro port of entry. There were no arrests.
“While attacks on Border Patrol agents are not uncommon, the agents showed great restraint when faced with the dangers of this unusually large group,” said Paul Beeson, the chief patrol agent for the agency’s San Diego sector. (link)

I still support the paralleling double chain-link barbed wire fence.  The same border containment/security device used between North and South Korea.   Each fence with 8” of groomed white sand between them so that visible footprints or crossings are evident to border patrol.   
Place night vision capable CCTV cameras in the locations difficult to patrol – remotely monitored, and/or live-fed to the web so people can watch from their home in any state 24/7.      Support that security with satellite tracking and pre-programmed, non manned,  fly alone drone use – which follows the border in 1,000 mile increments. 
The entire parallel fence could be built in 6 months or less by the Army Corp of Engineers and DHS.    Then move the state and federal offices of Homeland Security to the border in each Southern State.    As time progresses build the next 20 federal penitentiaries equidistant between the DHS offices on the border.
Done.  Border Secure.