http://en.wikipedia.org/wiki/Adolf_Hitler%27s_rise_to_power

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Hitler's rise to power in Germany began (at least formally)[1] in September 1919 when Hitler joined the political party that was[2] known as the Deutsche Arbeiterpartei (abbreviated as DAP, and later commonly referred to as the Nazi Party).
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Hitler's "rise" can be considered to have ended in March 1933, after the Reichstag adopted the Enabling Act of 1933 in that month; President Paul von Hindenburg had already appointed Hitler as Chancellor on January 30, 1933 after a series of parliamentary elections and associated backstairs intrigues. The Enabling Actâ€"when used ruthlessly and with authorityâ€"virtually assured that Hitler could thereafter constitutionally exercise dictatorial power without legal objection.
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Further down the page - more detail.

"Seizure of control (1931â€"1933)"

I dare say Joe may decide to prune this, but I have pruned it already ...

"... Street fights and beer hall battles resulting in deaths occurred throughout February and April 1932, all against the backdrop of Adolf Hitler’s competition in the presidential election. ... Hermann Göring, as speaker of the Reichstag, asked the Papen government to prosecute shooters. Laws were then passed which made political violence a capital crime. In the first round on 13 March, Hitler had polled over 11 million votes but was still behind Hindenburg. The second and final round took place on 10 April: Hitler (36.8% 13,418,547) lost out to Paul von Hindenburg (53.0% 19,359,983) whilst KPD candidate Thälmann gained a meagre percentage of the vote (10.2% 3,706,759).

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At the end of July, the Nazi party gained almost 14,000,000 votes, securing 230 seats in the Reichstag. Energised by the incredible results, Hitler asked to be made Chancellor. Papen offered the position of Vice Chancellor but Hitler refused.

Hermann Göring, in his position of Reichstag president, asked that decisive measures be taken by the government over the spate in murders of national socialists. On 9 August, amendments were made to the Reichstrafgesetzbuch statute on 'acts of political violence', increasing the penalty to 'lifetime imprisonment, 20 years hard labour or death'. Special courts were announced to try such offences. When in power less than half a year later, Hitler would use this legislation against his opponents with devastating effect.

The law was applied almost immediately but did not bring the perpetrators behind the recent massacres to trial as expected. Instead, five SA men who were alleged to have murdered a KPD member in Potempa (Upper Silesia) were tried. Adolf Hitler appeared at the trial as a defence witness, but on 22 August the five were convicted and sentenced to death. On appeal, this sentence was commuted to life imprisonment in early September. They would serve just over four months before Hitler freed all imprisoned Nazis in a 1933 amnesty.

The Nazi party lost 34 seats in the November 1932 election but remained the Reichstag's largest party. The most shocking move of the early election campaign was to send the SA to support a Rotfront action against the transport agency and in support of a strike.

After Chancellor Papen left office, he secretly told Hitler that he still held considerable sway with President Hindenburg and that he would make Hitler chancellor as long as he, Papen, could be the vice chancellor. On 30 January 1933, Adolf Hitler was appointed chancellor of a coalition government of the NSDAP-DNVP Party. The SA and SS led torchlight parades throughout Berlin. In the coalition government, three members of the cabinet were Nazis: Hitler, Wilhelm Frick (Minister of the Interior) and Hermann Göring (Minister Without Portfolio).

With Germans who opposed Nazism failing to unite against it, Hitler soon moved to consolidate absolute power."