The widespread intimidation of the population provided the essential precondition for a process that was in train all over Germany in the period from February to July 1933: the process, as the Nazis called it, of 'co-ordination', or to use the more evocative German term, "Gleichschaltung", a metaphor drawn from the world of electricity, meaning that all the switches were being put onto the same circuit, as it were, so that they could all be activated by throwing a single master switch at the center. Almost every aspect of political, social and associational life was affected, at every level from the nation to the village.
The Nazi takeover of the federated states provided a key component in this process. Just as important was the 'co-ordination' of the civil service, who's implementation from February 1933 onwards had put such powerful pressure on the Center Party (The Churches political wing) to knuckle under. Within a couple of weeks after Hitler's appointment, new State Secretaries - the top civil post - had been appointed in a number of ministries, including Hans-Heinrich Lammers at the Reich Chancellery.
Hermann Goering replaced twelve Police Presidents by mid-February. From March onwards, the violence of the stormtroopers was rapidly forcing politically unacceptable city officials and local mayors out of office- 500 leading municipal civil servants and seventy Lord mayors by the end of May. Laws eliminating the autonomy of the federated states and providing for each one to be run by a Reich Commissioner appointed in Berlin - all except one were Nazi party Regional Leaders - meant that there were few obstacles left after the first week of April to the 'co-ordination', or, in other words, Nazification of the civil service at every level. At the same time as the the state governments were being over-thrown, local Nazis, backed by squads of armed stormtroopers and SS men, were occupying town halls, terrorizing mayors and councils into resigning, and replacing them with their own nominees. Health insurance offices, employment centers, village councils, hospitals, law courts and all other state and public institutions were treated in the same way.
Between 30 January and 1 may 1933, 1.6 million people joined the Nazi party, dwarfing the existing Party membership. Up to 80 per cent of party members in Catholic areas such as Koblenz-Trier and Cologne-Aachen in the summer of 1933 had only joined within the previous few months. At a time when unemployment was critical in Germany very few workers if any could afford not to join the Nazi Party. Put short, everything and everybody was bought under Nazi control
in one way or another, the only organizations unaffected at this early stage was the army, the Church and its lay organizations, however, the Church's dream of remaining autonomous would not last as they only received this promise in principal, regardless of the fact they got it in writing few of them, if any, were ever kept by Hitler.
The answer to your question would have to be 'yes' the Nazis did in fact force people to join. Regardless of what is written above however, Hitler's popularity must not be underestimated at the time. Reich Minister of Justice, in 1936 - Julius Streicher, a Nazi with a particular fondness for hyperbole once said: 'It is only on one or two exceptional points that Christ and Hitler stand comparison, for Hitler is far too big a man to be compared with one so petty'!
The Coming of the Third Reich ...............Richard J. Evans
The Third Reich in Power
(How the Nazis won over the Hearts and minds of a Nation)............Richard J. Evans
(A Warning from History) ........................................... Laurence Rees