there is a group a people vs there are a group of people

Some examples from the web:

• That is why there is a group of thinking people, like Hu Jia, in China who have never abandoned their quest for the truth.
• There is a group of people who very definitely are planning to be there.
• This was a very important debate here, but the horrific humanitarian situation has been spoken about by other colleagues, and there is a group of people who is always forgotten;I just wanted their voice to be heard here today.
• Forgive me, Commissioner, for not waiting to hear your answer now, but there is a group of 100 people waiting for me 50 kilometres away.
• Iki mo deki nai kurai yodonda hito no mure There is a group of idle people who can't breathe
• Stage One is a group where people systematically sever relationships from functional tribes, and then pool together with people who think like they do.
• This is a group of people who want to tell you your work is going to live.
• This is a group of people who, along with the port as an infrastructure element, create a source of economic potential.
• It has emerged that there is a group of large financial corporations that collaborates with various bigwigs and local dictators to oppress their own people.
• There is a group of us all shattered by that question.
• There is a group of buildings around a sad playground.
• We were part of a group people who walked to the North.
• And out there, around the world, is a group of people called "miners."
• What if "A" is a group of people, all playing together for the same team?
• Finally, there is a group of amendments where the Commission prefers to keep to its original proposal.
• And there is a group in Holland that has 600 small, Dutch companies.
• The Manson Family worked as a group because they were attacking groups of people.
• They're a group of people who support our company.
• She didn't need a group of people around her.
• You, who runs a group teaching people to confront things head-on.

Some examples from the web:

• We are a group of people trying to have a nice, private evening.
• They are a group of people who want to start a co-op to produce Fair Trade coffee.
• The Manson Family worked as a group because they were attacking groups of people.
• They're a group of people who support our company.
• She didn't need a group of people around her.
• I have never worked with a group of people so unprofessional before.
• Just a group of people that call themselves crime fighters.
• Just a group of people that call themselves crime fighters.
• It was just a group of people walKing behind a banner for Matthew Shepard.
• It could also have been a group of people, though.
• A group of people from the metal works is coming to you.
• And so he's assembled a group of people.
• The truth about a group of people you call Research.
• There's a group of people in Kenya.
• Somebody somewhere, a group of people, starts clapping in rhythm with my steps.
• Just a group of people trying to survive.
• He lives with a group of people -
• We met in the mountains, a group of people.
• Get a group of people together.
• Dana, I'm here with a group of people.