We must use singular verbs with singular nouns, even if the noun is collective.
Wrong: The team of Indians were the best in the tournament.
Correct: The team of Indians was the best in the tournament.
Also Correct: The Indians were the best in the tournament.
Wrong: The collection of papers from the library were stolen.
Correct: The collection of papers from the library was stolen.
Also Correct:
The papers from the library were stolen.