I found this; it's just partial but is it the correct one?

Our parents fought this fight before and thought that they had won
You should have seen the boss turn green and how that man could run,
But when our parents turned their backs the boss came again to dodge their tax
And the next time we'll not be so lax and we'll have a Mayday then.
We'll have a May Day My o My, we'll have a May Day then,
We'll have a May Day MY o My, We'll have a May Day then.