More info for those who didn't live through it.
In that 1970 draft, 33 players were drafted from a 14-team league. 9 teams gave up 2 players, and 5 teams gave 3.
From memory, in some expansion drafts, each team could hold 7 players (whom each team named in advance), so a team might lose its 8th, 9th, and 10th-best players. In other years, I think they could reserve only 6. That can really hurt.
In the very last couple, I seem to remember they could hold 8. This lack of quality caused each new team to hurry to trade many draftees before the season began.