The Avengers have had various members on their team over the years. The original roster included Captain America, Iron Man, Thor, The Wasp, Ant-Man, and The Hulk. However, they only operated for about a year, from 1963 to 1964, before most of the original members took a break and handed the Avengers name over to a string of successors.
Source:https://www.cbr.com/weird-avengers-teams/