"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protester expresses opposition to government spying by the NSA.

"Million Mask March" protester expresses opposition to government spying by the NSA.

This parent was among the protesters joining the "Million Mask March" in Denver.

"Million Mask March" protester expresses opposition to government spying by the NSA.

These students donned "anonymous" masks to join the "Million Mask March" in Denver.

These students donned "anonymous" masks to join the "Million Mask March" in Denver.

These students donned "anonymous" masks to join the "Million Mask March" in Denver.

Parents with small children were among protesters joining the "Million Mask March", in Denver. (11/5/13)

Parents with small children were among protesters joining the "Million Mask March", in Denver. (11/5/13)

Parents with small children were among protesters joining the "Million Mask March", in Denver. (11/5/13)

Parents with small children were among protesters joining the "Million Mask March", in Denver. (11/5/13)

Parents with small children were among protesters joining the "Million Mask March", in Denver. (11/5/13)

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protester expresses opposition to government spying by the NSA.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

Parents with small children were among protesters joining the "Million Mask March", in Denver. (11/5/13)

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

Masked protester displays American flag at "Million Mask March" in Denver.

Masked protester displays American flag at "Million Mask March" in Denver.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

"Million Mask March" protesters gathered near the state capitol building in Denver and later marched through the city's downtown area.

Protester at the Million Mask March in Denver, displays the "anonymous" flag.