The phrase "a massive group of" is correct and usable in written English.
It can be used to describe a large number of people or things gathered together.
Example: "At the concert, there was a massive group of fans eagerly waiting for the band to take the stage."
Alternatives: "a large crowd of" or "a huge assembly of".
"Almost immediately they were rushed by a massive group of Tibetans," one witness said.
Everybody talks about how people in New York are obsessed with money and glory, and here's a massive group of people who answer an ad".
"So, we have there a massive group of children that are unvaccinated and may be one of the causes of the outbreak of measles we are having today".
But at one spot in California, the absence of rangers meant a takeover by a horde of a different sort: a massive group of boisterous elephant seals.
In 2013, the Psychiatric Genomics Consortium, a massive group of over 800 investigators from 38 countries, reported genetic analyses from 17,000 people with MDD without finding a single genetic change, or variant, that was meaningfully associated with the disease.
An important advantage of the tool presented is the parametric design capability, allowing the user of FAST/AeroDyn/HydroDyn codes to analyze a massive group of cases; therefore, optimal design can be carried out.
A massive group, To the Friendship of the English Speaking People, was dedicated at Bush House in London in 1925.
Directed by MIT student Eddie Ha, the video is evidence of a massive group effort on the part of the MIT community.
Then we gather together to "break the fast," resulting in a massive group binge the likes of which have not been seen since my junior year of college.
If this all seems daunting for a newcomer, the Project Awesome team ensure that it is not – newbies are made to feel especially welcome right up until the end when I am forced inside the centre of a massive group – you guessed it – hug.
There was home to a constant, often massive group of people waiting to get inside to buy one.
